Lens filters
UV filters: clear to yellowish tint
- Haze 1, UV 1a, UV-010, UV(0) - block about 70% UV, reduces blue haze a notch
- UV-15 - block about 81% UV
- UV2, UV-415, UV2A, UV2B - block 100% UV - shore, large reflective areas (water, snow), high altitudes
- UV17 - 97%
- UV-410 - for high-altitude and open water
- UV-420 - extends to visible, warm tint
- L37 - extends to 370nm
- L39 - extends to 390nm
skylight filters: pink tint
- Skylight 1A
- Skylight 1B - darker
- some can have similar to UV2A color characteristics
MIDP machine vision filters
http://midopt.com/filters/
bandpass
230-280nm - The BP250 filter is a very broadband UV filter, mainly intended for deep-UV imaging. It is the only MidOpt UV filter available that offers excellent
visible and near-IR blocking (≤0.1% abs. ≥400nm; ≤0.06% abs. ≥415nm), thus making it best suited to distinguish features or characteristics
that are only visible under UV illumination. Peak transmisson only 35%.
290-365nm - Useful in UV imaging applications, BP324 filters have a broad spectral bandwidth in the UV while effectively blocking most visible and infrared light.
Note that there is a slight deep red/near IR leak that peaks at about 720nm. Because this filter absorbs all unwanted visible and/or infrared light,
it is not recommended for placement in front of intense (white) light sources.
Passes UV portions 320-380 nm and 280-320nm. Blocks < 280 nm. Configurations can also be supplied for mounting in front of UV LED light sources.
335-400nm - 365nm LED; BP365 UV Blacklite dichroic filters can be used with all UV LED, UV fluorescent and other UV-producing lamp-based lighting.
BP365 filter material is designed to block the visible and pass UV light, including 395nm and all other popular UV LED wavelengths.
It is also useful for near-UV fluorescence imaging, blocking visible light and light from UVC LED excitation sources,
allowing early removal of biofilms (for instance, in disinfection applications or biofouling of ship hulls) through tryptophan fluorescence detection.
425-495nm - 450,465,470nm LED; BP470 filters enhance viewing of subjects illuminated by blue LED lighting and any UV- excited blue fluorescence emissions (430-500nm).
Its broad bandwidth and high peak (T ≥90%) transmission results in significantly brighter, higher contrast images. For most machine vision UV fluorescence applications.
85% of all industrial UV fluorescence applications involve imaging a blue fluorescence.
Use of a BP470 or similar blue bandpass filter is almost mandatory in order to obtain adequate contrast.
380-575nm - BP485 is commonly used as an internal infrared blocking filter in cameras. When working with any camera that has had its internal filter removed,
a mounted BP485 filter can also be considered in order to, when desired, allow it to once again work like the unmodified camera.
440-555
485-550 - 505nm LED; BP505 are single substrate, hard-coated filters designed to match the output of most cyan LEDs. Coupled with the spectral sensitivity
of most CCD/CMOS sensors in use today that also peak in this range, using this filter can result in images that are especially bright
and very high in contrast. It is particularly useful for line scan/wide angle applications.
Industrial fluorescence applications are often overwhelmed by the UV light source itself and/or ambient light.
An appropriately matched bandpass filter will usually eliminate this problem.
500-555nm - 520,525,530nm; BP525 filter material is designed for use with green LED lighting, 532nm laser illumination and green UV fluorescence applications.
A BP525 filter has a broader range, higher peak transmission and superior blocking of UV and NIR wavelengths compared to commonly found all-dichroic
green bandpass filters – improving contrast by blocking significantly more of the unwanted light.
495-565nm - photopic response, PE530
515-560nm - 520,525,530nm LED; BP540
410-690nm - BP550 filters effectively pass all visible light and block all light outside the visible range without "discoloring" the image.
This single substrate, hard-coated filter is designed for use in full color, white light applications where either IR or UV light (or both) may be present.
560-600nm - 590nm LED; BP590 filters are recommended for use in systems that make use of amber or orange LED lighting. These filters are also widely used
in fluorescence imaging applications, particularly with dyes such as ethidium bromide, or when working with Qdot 565, 585 or 605.
615-645nm - 617,625,630nm LED; A BP635 filter is recommended for use with 615-645nm LED and laser diode lighting. Because of its broad bandwidth and high peak transmission,
BP635 filters work very well for all "light red" lighting applications in this range.
640-680nm - 660nm LED; A BP660 filter is recommended for use with 650-680nm LED and laser diode lighting.
Because of the ample passband and excellent in-band transmission, it works well with all camera-related applications in this range.
680-720nm - 695nm LED; Recommended for use with near-infrared LEDs.
BP695 is also useful for imaging typically weak luminescence where the subject is often excited with 635nm or 660nm red LED lighting.
715-780nm - 740nm LED; Recommended for use with near-infrared LEDs, BP735 filters are designed for viewing subjects in the 700-770nm range.
Blocks all UV and visible light, optimizing results achieved with IR lighting used in traffic control and license plate recognition systems.
745-950nm - 800nm LED; BP800. Recommended for use with broadband (typically filtered) near-infrared lighting, this single substrate, anti-reflection coated filter
is a very broad absorptive filter. Among all absorptive filter glasses, it is unique in its ability to retain its opacity at thicknesses of 1mm and below.
790-830nm - BP810 filters are designed for use in 800-830nm laser diode applications. They are insensitive to “blue shifting” experienced when using line or
pattern generating lasers together with wide angle lenses. About 70% of cold therapy lasers used for the regeneration of damaged tissue that are out
on the market operate at or near 810nm. Mounting this filter on a camera lens used in bright sunlight will better allow the laser beam to be imaged.
However for a majority of 810nm applications, we normally recommend our BN810 filter option.
830-865nm - 840,850nm LED; BP845
820-910nm - 840,840nm LED; BP850. Recommended when using high-power 830-850nm LED or laser diode lighting to improve contrast in surveillance applications
or when inspecting in the infrared, this filter features high peak transmission and particularly durable, robust coatings.
This filter's coated surface also greatly inhibits staining due to year-round issues with heat, humidity, and/or air quality that affect uncoated infrared filters.
840-880nm - 840,850,880nm LED; BP865
845-930nm - 880nm LED; BP880. Recommended when using high-power 860-880nm infrared LED lighting or 905-920nm laser diodes, this filter also features
high peak transmission and rugged coatings that provide added environmental stability.
930-1030nm - 1000nm LED; BP1000
1485-1645nm - 1550nm LED; BP1550
narrow bandpass
460-490nm - 450,465,470nm LED; Commonly used in fluorescence applications, a BN470 filter is suitable for use in LED or laser diode applications with
higher than normal ambient lighting conditions and is less sensitive to angle of incidence variations than traditional interference filters.
480-495nm - 480,490nm LED; BN485
475-500nm - 480,490,500nm LED; BN490
525-550nm - 520,525,530nm LED; Commonly used in fluorescence applications, a BN532 filter is suitable for use with lasers and laser diodes
and is less sensitive to angle of incidence variations than traditional interference filters.
580-610nm - 590nm LED; Commonly used in fluorescence applications, BN595 filters are suitable for use with laser diode and LED illumination when strong ambient lighting is a problem.
625-645nm - 617,625,630nm LED; Commonly used in outdoor applications where strong sunlight is often a problem, a BN630 filter is suitable for use
with LED and laser diode illumination. It exhibits less effect from "blue shifting" in wide angle applications.
638-672nm - 650nm LED; BN650 Narrow Red Bandpass filters are useful in applications where intense sunlight or other interfering ambient light is present. BN650 filters are compatible
with 650nm laser diodes and LEDs, commonly used in laser pointer and line generators. Compared to traditional interference filters, these filters are less susceptible
to short shifting due to angle of incidence variations.
645-675nm - 660nm LED; Commonly used in outside applications bothered by intense sunlight, BN660 filters are suitable for use with 660-670nm laser diodes and LED lighting,
and are less sensitive to angle of incidence variations than traditional interference filters.
730-755nm - 740nm LED; One of the commonly used IR illumination wavelengths, BN740 filters are suitable for laser diode and LED applications. The narrow band design is ideal
when there are overwhelming ambient light conditions. Commonly used in security, traffic control and industrial inspection applications.
770-790nm - For use with 780-785nm IR illumination wavelengths, including LED and laser diode lighting, the narrow band design is ideal for use when ambient light conditions
can be overwhelming. Commonly used in traffic control, security and license plate recognition applications.
798-820nm - A BN810 filter is designed for 810nm laser diode illumination. The narrow band design is ideal when there are overpowering ambient light conditions.
It is used in security, traffic control and Industrial Inspection applications.
835-845nm - 840nm LED; BN840
840-865nm - 840,850nm LED; These filters are available for use in conjunction with commonly used IR illuminators operating at or around the 850nm wavelength. BN850 filters
feature a narrow band design that is ideal for use when ambient light conditions create poor contrast.
They are commonly used in security, traffic control, LPR and industrial inspection applications.
855-890nm - 880nm LED; Designed for IR illumination applications, BN880 filters are suited for situations when other lighting wavelengths are also present.
It is most commonly used in machine vision systems with 880nm LED lighting.
928-955nm - 940nm LED; BN940 Narrow Near-IR Bandpass filters feature a narrow band design with improved blocking of unwanted light and greater insensitivity
to short shifting, making them particularly essential when 940nm lighting is used together with a short focal length camera lens.
940nm LEDs are commonly used in remote control devices and in security/surveillance lighting. 940nm illumination is often considered "covert",
as little if any faint red glow is produced from these LEDs, even in complete darkness. Unfortunately CMOS and CCD cameras have
greatly reduced sensitivity at these wavelengths, and strong ambient light can often make imaging in this range very difficult.
narrow bandpass interference
400-415nm - 405nm LED; Bi405 Violet Interference Bandpass filters can be beneficial in removing ambient light in order to image subjects illuminated with 405nm laser diodes.
405nm wavelength is commonly used in Blu-ray applications similar to blacklite filters. This filter is also used in fluorescence applications.
425-455nm - 425,440,450nm LED; Bi440
445-465nm - 450nm LED; Bi450 Blue Interference Bandpass filters are recommended for use with 450nm blue diode lasers and/or LED lighting. When precise illumination control
is needed or similar blue wavelengths are also being simultaneously imaged with other cameras, Bi450 filters effectively block out almost all interference
from other blue light sources as well as all other visible and near-IR wavelengths. These filters are also excellent for use in vegetative health monitoring
applications where separate blue plus near-IR imaging sensors/cameras are used as opposed to the more traditional NDVI index applications that utilize red plus near-IR wavelengths.
510-525nm - 520,525nm LED; Bi518
515-525nm - 520,525nm LED; Bi520 Green Interference Bandpass filters typically are used in applications employing 520nm green laser diodes or green 520nm/525nm LED light sources.
The latter typically find use in machine vision inspection while the former are commonly used in bioanalytical applications. Various popularly used fluorophores
(e.g., GFP, GelStar, SYBER Green, etc.) have emission maximas at or very near 520nm, and Bi520 filters can be used to effectively block excitation sources
and interfering longer and shorter wavelength light while letting this light pass through to the camera’s sensor.
535-558nm - 550nm LED; Bi550 filters are designed to block unwanted ambient light when imaging subjects illuminated with 550nm green LEDs. They are also used to isolate
the green vegetation signal used to arrive at EVI (Enhanced Vegetation Index) and other similar plant health numerical indices.
625-640nm - Recommended for use with red laser diodes and/or LED lighting where precise illumination control is needed or similar red wavelengths are also simultaneously
being imaged with other cameras. Bi632 filters effectively block out almost all interference from other red light sources.
643-665nm - Bi650
650-665nm - Bi660 filters are recommended for use with dark red laser diodes and LED lighting operating in the 660-670nm range, in situations
where ambient light can be overwhelming or separation from other red lighting wavelengths is needed.
717-732nm - Bi725 is designed for use in certain aerial vegetative health monitoring applications. This so-called "Red Edge" filter isolates the wavelength region
where the most rapid change in reflectance occurs in foliage. When plants are stressed or dying, photosynthesis slows down or stops.
IR wavelengths are absorbed, while more visible light–particularly red light–is reflected. The transitional 725nm band is uniquely affected
by vegetative health changes and provides information relating to chlorophyll and nitrogen status used to distinguish thriving from stressed vegetation.
765-795nm - 765,780nm LED; Bi780
798-820nm - Bi808
810-850nm - 840nm LED; Bi830
845-860nm - Bi850
870-890nm - 870,880,890nm; Bi880
1290-1310nm - 1290,1300,1310nm LED; Bi1300
1440-1460nm - 1440,1450,1460nm LED; Bi1450
1540-1560nm - 1540,1550,1560nm LED; Bi1550
dual-band
375-425nm, 745-970nm - DB395/870 Dual Bandpass Filter passes UV-Violet and infrared wavelengths, effectively blocking all green and red light. These filters have
traditionally found use in NDVI-type imaging applications. When using a single camera modified for aerial agricultural surveillance, incorporation of these
so-called “Superblue” or “Infrablue” filters allows reflected near-infrared light (745-970nm) to be captured in the camera sensor’s red channel
and reflected violet light (375-425nm) to be captured in the sensor’s blue channel (the green channel is not used). Even when using an inexpensive
consumer camera (that has first had its IR blocking filter removed), this easy separation then makes it possible to post-process the red and blue channels
for NDVI by performing the calculation: NDVI = (red – blue) / (red + blue). Healthy vegetation will absorb (not reflect) blue light and strongly reflect
near-infrared light. While “Superblue” filters similar to DB395/870 have seen much use during recent years, for far better wavelength separation and contrast
we strongly recommend the use of our newer DB475/850 or DB660/850 dualband filters instead.
460-490nm, 830-870nm - The DB475/850 Dual Bandpass Filter has been primarily designed for NDVI imaging applications. When using a single camera, incorporation of this filter
allows reflected near-infrared light (850nm) to be captured in the camera sensor’s red channel and reflected blue light (475nm) to be captured
in the sensor’s blue channel (the green channel is not used). Even when using an inexpensive consumer camera (that has first had its IR blocking filter removed),
this easy separation then makes it possible to post-process the red and blue channels for NDVI by performing the calculation: NDVI = (red – blue) / (red + blue).
Healthy vegetation will absorb (not reflect) blue light and strongly reflect near-infrared light. Thus this information can then be used to apply a false color
gradient to images to better highlight the contrast between regions of healthy vegetation vs. areas with stressed/diseased or no vegetation.
535-565nm, 830-870nm - 548,840,850nm LED; The DB550/850 compliments the DB660/850 and DB475/850 filters. When modifying a single color camera by removing its IR blocking filter,
incorporation of this filter in its place allows reflected near-infrared light (850nm) to be captured in the camera sensor’s red channel
and reflected green light (550nm) to be captured in the sensor’s green channel (the blue channel is not used).
Healthy vegetation will absorb (not reflect) blue light and strongly reflect near-infrared light. Thus this information can then be used to apply a false color
gradient to images to better highlight the contrast between regions of healthy vegetation vs. areas with stressed/diseased or no vegetation.
There are a range of vegetation indices used by the remote sensing and precision agriculture community, and while NDVI is probably the most common,
each have their advantages. Any of the indices listed below can be considered when employing a single color sensor camera that has been converted using
a DB550/850 filter. Information gathered can then be overlaid on vegetation maps to provide information used to make better crop management decisions.
Green Chlorophyll Index CIg = (NIR / Green) – 1
Green Difference Vegetation Index GDVI = NIR – Green
Green Normalised Difference Vegetation Index GNDVI = (NIR – Green) / (NIR + Green)
Green Ratio Vegetation Index GRVI = NIR / Green
Green Soil Adjusted Vegetation Index GSAVI = [(NIR – Green) / (NIR + Green + 0.5)] * (1 + 0.5)
645-675nm, 830-870nm - The DB660/850 filter has been designed primarily for NDVI imaging applications. When using a single camera, incorporation of this filter allows
reflected red light (660nm) to be captured in the camera sensor’s red channel and reflected near- infrared light (850nm) to be captured in the sensor’s blue
channel (the green channel is not used). Even when using an inexpensive consumer camera (that has first had its IR blocking filter removed), this easy separation
then makes it possible to post-process the red and blue channels for NDVI by performing the calculation: NDVI = (blue – red) / (blue + red).
Healthy vegetation will absorb (not reflect) blue light and strongly reflect near-infrared light. Thus this information can then be used to apply a false color
gradient to images to better highlight the contrast between regions of healthy vegetation vs. areas with stressed/diseased or no vegetation.
405-645nm, 725-755nm - DB735 filters pass visible light and 735-740nm LED light. These filters allow maintenance of excellent color rendition while taking advantage
of any camera's significantly higher spectral response at lower near-infrared wavelengths.
Useful for license plate recognition, traffic control, surveillance and machine vision applications.
405-645nm, 835-875nm - 840,850nm LED; A DB850 filter passes visible and 850nm LED or laser diode illumination. 850nm LEDs are perhaps the brightest of all infrared LEDs.
Using a DB850 filter over (or behind) the camera lens allows for full color imaging by day and excellent monochrome contrast at night.
Useful for machine vision and day/night surveillance applications.
405-650nm, 925-965nm - 940,950nm LED; A DB940 filter passes visible and 940nm LED light. 940nm LEDs do not emit the faint red glow associated with 850nm and other lower near-IR LED wavelengths.
Using a DB940 filter over or behind the lens allows full color imaging during the day and covert surveillance at night. However any camera's spectral response
at 940nm will be lower than at other, shorter near-IR wavelengths, so relative sensitivity of each camera's imaging sensor at 940nm must also be considered.
triple-band
468-483nm, 543-558nm, 835-865nm - TB475/550/850 Triple Bandpass Blue+Green+850nm NIR Filter, when mounted in converted consumer cameras used
in aerial surveying applications, can help provide a more affordable, lightweight alternative vs. systems employing three or more cameras or sensors.
Blue-Green-Near IR Extended Normalized Difference Vegetation Index (ENDVI) data gathered for vegetative health monitoring can be used to provide similar,
but spectrally different information as compared to traditional NDVI data. Soil background, differing atmospheric conditions and various types of vegetation
can all influence the reflection of visible light somewhat differently. ENDVI analysis may, at times, be able to impart more accurate or reliable information
regarding plant or crop health by additional leveraging of information in the blue portion of the spectrum. The formula used is:
Extended Normalized Difference Vegetation Index ENDVI = [(NIR + Green) – (2 * Blue)] / [(NIR + Green) + (2 * Blue)]
543-558nm, 653-668nm, 835-865nm - MidOpt triple bandpass filters are primarily designed for aerial agriculture mapping and surveying purposes. Green-Red-Near IR data
is used for applications where Chlorophyll Vegetation Index (CVI) and other vegetative index monitoring is preferred. TB550/660/850 filters, when mounted
in converted consumer cameras, can help in achieving a more affordable, lightweight alternative to systems using three or more cameras or sensors. Some of the
formulas that are employed in these cases include:
Chlorophyll Vegetation Index CVI = (NIR * Red) / (Green ^ 2)
Normalized Green NG = Green / (NIR + Red + Green)
Normalized Near Infrared NNIR = NIR / (NIR + Red + Green)
Normalised Red NR = Red / (NIR + Red + Green)
Triangular Vegetation Index TVI =0.5 * (120 * (NIR – Green) – 200 * (Red – Green))
long-pass
480-1100nm - A LP470 filter passes most visible and near-IR wavelengths of light. Used with monochrome cameras to aid in increasing contrast and resolution
by blocking UV and shorter deep blue wavelengths.
To achieve a similar effect while also blocking longer wavelengths including the near infrared, see our BP505 filter - transmitting longer wavelengths
often leads to decreased contrast in many LED-illuminated imaging applications.
510-1100nm - Typically used with a monochrome camera, LP500 filters block UV and virtually all blue light while passing longer visible and near-IR wavelengths.
To block longer wavelengths, including the near infrared, see our BP525 filter. Transmitting longer wavelengths can result in washed-out, low contrast
images. This material may also be used to block stray light emitted by UV and blue LED light sources.
520-1100nm - Used with black-and-white cameras to aid in increasing contrast and resolution, LP515 filters block blue and UV wavelengths and pass all other visible
and near infrared light.
To block longer wavelengths – including infrared light – see the BP535 bandpass filter. Longer wavelengths can have adverse affects when trying to separate subject matter.
545-1100nm - Used with a monochrome camera to provide increased contrast and resolution, LP530 filters block blue-green and UV light and pass longer wavelengths.
To block longer wavelengths, including the near-infrared, please see our BP595 Bandpass filter.
560-1100nm - Normally used only in monochrome applications, LP550 filters block UV and shorter visible light wavelengths and pass orange, red and near-IR light.
To block longer wavelengths including infrared, wavelengths that your camera might be sensitive to, see our BP595 Bandpass filter option.
585-1100nm - Used with monochrome cameras in orange-red imaging applications, LP580 material blocks UV, blue, yellow and green light, but passes longer wavelengths.
To also eliminate longer wavelengths, consider our BP595 or BP635 Bandpass filters.
620-1100nm - A LP610 filter is suitable when using a monochorome camera and the intention is to pass both red and near infrared wavelength light.
When red LED lighting is used, in most cases a BP635 or BP660 Bandpass filter will be more beneficial. In either of these cases, longer infrared
wavelengths generally can have a negative effect on contrast. These filters have also seen use in single camera NDVI imaging applications as an alternative
to “Wratten 25 or 25A” filters. However for such uses we would instead recommend our DB660/850 as a far superior alternative.
645-1100nm - LP630 filters pass deep red and near-IR light while blocking all other visible wavelengths. Blocking infrared light will usually provide
significant added benefit as far as easier recognition of subject matter. In that case, please see the BP660 Bandpass filter.
650-1100nm - Recommended for night vision applications using a filtered broadband light source; incorporating a LP645 filter blocks most visible light
while passing deep red and NIR wavelengths. To block longer wavelengths including the infrared, see our BP660 or BP695 Bandpass filters.
680-1100nm - Used often with monochrome cameras to aid in increased contrast and resolution in the near-IR, LP665 filters will block most visible light
while passing deep red and all NIR wavelengths. To block longer infrared wavelengths, see our BP695 Bandpass filter.
715-1100nm - Recommended for enhancing subject recognition in the IR, LP695 filter material cuts on sharply at the beginning of the infrared portion of the spectrum,
passing the complete NIR spectrum. To block unwanted longer infrared wavelengths, using the BP735 Bandpass filter is an excellent alternative.
730-1100nm - Used with a monochrome camera to improve infrared contrast and resolution, LP715 filters block all visible light while passing Near – IR wavelengths.
To block deeper infrared light we recommend our BP800 Bandpass filter an effective choice when the filter material is 1mm thick or less.
800-1100nm - Recommend for use with laser diodes and LED lighting that operate in 810-830nm range LP780 filter material is commonly used for Near-IR wavelengths
found in machine vision applications. An alternate-use bandpass filter would be our BP810 filter.
820-1100nm - LP800
825-1100nm - LP815
845-1100nm - LP830 is suggested for use with infrared LED lighting emitting at 880nm or 850nm when it is also desirable to transmit other longer infrared wavelengths as well.
Otherwise we recommend our BP880 or BP850 filters not only for their longer wavelength blocking, but their overall higher peak transmissions.
870-1100nm - LP850 filter material is excellent for eliminating overwhelming visible and NIR ambient light, particularly in cases where the spectral response of the camera
beyond 900nm is approaching zero. Otherwise we encourage customers to consider using an LP920 filter instead.
910-1100nm - LP900 filters sharply block light below 900nm while allowing longer wavelengths to pass. This would be the filter of choice when viewing reflected 915nm laser
diode light. These filters can also be used in infrared digital photography, as detector windows and in various scientific and forensic applications. For example,
images of blood stains or gun shot residue on dark-colored fabrics or denim can often be enhanced by causing the fabric to appear white or comparatively
much lighter when using a LP900 filter over the lens of a camera that has had its IR blocking filter removed.
930-2300nm - 940,950nm LED; Designed to be used with 940nm LED illumination, LP920 filters block visible and unwanted near-IR wavelengths. It can also be placed in front
of multi-spectral lighting used in semi-covert or photographic darkroom applications.
1010-2300nm - A LP1000 cuts on starting at 860nm and is most frequently used with infrared Vidicon or InGaAs cameras, where it generally cuts off wavelengths short
of the 1550nm telecommunications band. This filter blocks almost all light that CCD/CMOS cameras are sensitive to.
1100-2300nm - LP1070
1490-2300nm - LP1475
1490-2300nm - LP1475a
1900-12000nm - LP1850
shortpass - vis pass
340-500nm - Passes blue light while blocking the green and red portions of the spectrum. SP510 filters are useful for improving contrast and resolution, and separating
colors in black and white or color applications, as when separating gold metallic finishes from silver metallic finishes.
410-560nm - Useful for applications requiring the complete removal of orange, red and near infrared portions of the spectrum. Some common applications: include viewing
hot rolled steel or, often in conjunction with a suitable neutral density filter, viewing arc welding operations.
395-575nm - Applications with an overwhelming amount of orange, red and near-IR light will benefit best from a SP585 filter. Useful for viewing of hot rolled steel
to see certain temperature areas while not blinding the system. Often a SP585 filter will be used simultaneously with a neutral density filter.
395-475nm, 605-700nm - NF550
shortpass - vis pass, NIR block
425-620nm - SP625 filters are used to remove most of the red wavelengths and all of the near-IR light from a scene. At times some camera sensors can have an inordinate
amount of red content, thus greatly affecting apparent color. In these cases a SP625 filter may be preferred over a SP645 filter.
380-585nm - SP635 filters are commonly used inside cameras to block infrared light. When working with any camera that has been modified and its internal IR cut filter
has been removed, a SP635 filter mounted on the front of the lens, when desired, can return function once again like the unmodified camera. This is
an absorptive infrared rejection filter that is also recommended for protecting a camera’s sensor from stray light emitted by lasers or other high power
near-IR light sources. SP635 filters are A/R coated on both sides to maximize visible band transmission while offering superior out-of-band blocking.
395-638nm - SP644 is one of several dichroic filters offered mainly for use as an internal infrared blocking filter in color cameras. This design offers an attractive
price/performance option compared to other designs. Uniform blocking of near-infrared wavelengths out to 1100nm, uniformly high transmission across
the visible range, and a 50% point in the middle of the red portion of the spectrum make this an ideal choice for cameras with typical CMOS sensor
responsivity. SP644 is useful to achieve natural color rendition with superior response in the blue channel.
400-640nm - SP645; Our most popular near-IR blocking filter for inside-the-camera applications. Also referred to as an infrared cut filter, these filters limit
the amount of infrared radiation that reaches delicate CCD and CMOS sensors. Near-IR blocking is unusually exceptional in the case of these filters.
CCD/CMOS imagers are very sensitive to infrared radiation and, often, deep red wavelengths as well. Using a SP645 filter will reduce or prevent a reddish,
washed out coloring of the final image. These filters are 1mm thick.
400-640nm - SP650
420-660nm - SP675 filters excel at providing accurate color rendition for digital cameras. Compared to any other IR cut filters available from various suppliers,
SP675 filters are notably more efficient at blocking near IR radiation to a far greater degree. These filters block slightly less red light compared
to SP645 filters. Custom fabricated diced or rounded SP645 and SP675 filters can be supplied with short lead times.
410-690nm - Also referred to as a hot mirror, SP700 filters are recommended for broad visible wavelength transmission and complete IR blocking over the sensitivity
range of a monochrome camera with minimal effect on the red portion of the spectrum. These filters can be provided off-the-shelf in mounts
or with very short lead time in virtually any unmounted size or configuration in 1mm or 2mm thickness and diameters up to 600mm.
410-690nm - For applications in which full spectrum infrared (i.e., heat) and/or UV radiation are an issue, SP701 filters provide extended hot mirror blocking
throughout the UV and in the near-IR out to 1550nm. The substrate is heat-resistant Borofloat and it comes in 1mm and 2mm thicknesses. Custom
unmounted sizes can be provided up to 760 x 200mm in size.
370-630nm - SP705 is an absorptive infrared rejection filter recommended for blocking stray or scattered light from higher power near IR light sources, particularly
lasers, and protecting a cameras sensor. Both surfaces are multilayer anti-reflection coated to improve visible light transmission and prevent staining.
400-710nm - SP730 a heat resistant filter reduces IR radiation/camera bloom while having no effect on the apparent color of an image. The color temperature
characteristics of any given camera sensor will remain unchanged. A broadband multilayer anti-reflection coating is present on the second side
of this dichroic hot mirror.
425-770nm - Designed to pass visible and shorter NIR wavelengths and assist in filtering near-IR light sources, SP785 can be considered in some cases
as an alternative to using a DB735 filter. The second surface is provided with a high efficiency anti-reflection coating.
light balancing
LA080 Light Balancing Filter (Minus Blue) - LA080 corrects the ~80 mired color change created by some high color temperature lighting (appearing bluish)
including some Xenon and metal halide lamps while eliminating a large portion of the UV spectrum.
LA120 Light Balancing Filter (Minus Blue) - LA120 counteracts the ~120 mired color change created by traditional white LEDs (appearing very bluish in cast)
as well as some similar xenon and metal halide lighting, while eliminating a large amount of the UV spectrum. Instead of using warm white LEDs,
placing an LA120 filter over the camera lens and using cool white (blueish) LEDs results in the same apparent color, but a light head with higher
intensity, longer life, and lower cost.
LB080 Light Balancing Filter (Minus Red) - The LB080 is used to raise lower color temperatures (by 80 mired) by highlighting a higher percentage
of the red component of the spectrum – to create more natural looking color. It is sometimes used with fiber optic lighting.
LB120 Light Balancing Filter (Minus Red) - Used to raise color temperature by reducing unnatural red tones created by some sodium and mercury lighting.
LB120 filters are placed over the camera change and shift the apparent color by 120 mired.
FL550 Light Balancing Filter (Minus Green) - Used to eliminate the strong greenish color that often results when illuminating with white fluorescent lighting.
The FL550 absorbs light in the middle of the visible spectrum, which is where most color cameras have their strongest response,
eliminating a greenish cast, resulting in true-to-life color rendition.
astronomy filters
lines
393+396nm - Ca II or Ca-K/Ca-H (less common) - solar observations
468nm - He II (less common)
484-506nm - common range of ultra-high contrast (UHC) filters to suppress light pollution; passthrough of H-beta, O-III
486nm - H-beta
, strong sources
496+501nm - O-III filter, common, both strong lines, in emission nebulae
587nm - He I (less common)
630nm - O I (less common)
658+654nm - N II (less common) - included in wider H-alpha filters
656/28nm - H-alpha, very common
Very narrowband (even 0.05nm) for solar observations, shows solar flares and prominences
Narrowband (3..12nm) for night sky observations, to see H II regions of nebulas
672nm - S-II line, common
713nm - Ar III (less common)
889nm - methane (less common); clouds on gas giants, Venus; with filter, Sun
colors
neutral density - for solar observations, also "Moon filters" to improve contrast of moon observations
red - reduces sky brightness; Mars observations (maria, ice caps/polar areas); better contrast of blue clouds against background on Jupiter, Saturn
deep yellow - Venus (atmospheric features), Jupiter (polar regions), Saturn, Mars (polar caps, clouds, ice, dust storms); comet tails (enhanced)
dark green - Venus (cloud patterns, reduces sky brightness for daily observations), Mars (ice, polar caps), Jupiter (Red Spot and other features), Saturn (polar regions, white clouds)
medium blue - Moon (contrast), Venus (faint shading of clouds), Mars (clouds, storms, surface features), Jupiter/Saturn (atmosphere features boundaries), comet tails (better definition)
infrared photo filters
(cut/paste from aliexpress seller)
1000nm is suitable for low latitudes and strong light use.
950nm is suitable for outdoor and strong light use.
850nm is suitable for outdoor and not too strong light use.
850nm : When the weather is good, the sky knows, can get high contrast images, have better penetration to haze, apply to the environment of the infrared ray is not too strong
760nm is suitable for indoor and weak light use.
760nm : In theory there is a color, in fact, the color is very shallow, is almost black and white, in the sunshine outdoor is better to compare high contrast can be obtained when using pure infrared photo
720nm is suitable for indoor and weak light use.
720nm : Mainly for no function of infrared digital camera (or infrared camera outside shooting model), the effect of infrared and visible light colors coexist, with some shooting skills and post-processing, half a red effect can be obtained
680nm : Scenery photo is most suitable for 680nm infrared filter, infrared scene showing a normal color under different style, like a dream, even under the most common scene in infrared and artistic
various filters use
nomenclature:
- [wavelength]bp[width] - bandpass filter
- [wavelength]lp - lowpass filter
214bp7 Cd
214bp10 Cd
232bp10 Cd
250alp lowpass
325sp UVB highpass
335bp10 UV absorption analyzer
340bp10 UV absorption analyzer
375dlrp lowpass dichroic UVB reject
390alp lowpass
390dlrp lowpass dichroic UVA reject
400df20 mercury or analytical instrument
400alp lowpass
404bp10 mercury H line or analytical blk FIR
404bp13 mercury or analytical instrument
405bp10 UV absorption analyzer
405df40 blue absorption analyzer fluorescence
410aelp lowpass blocks UV and deep blue
420aelp lowpass blocks UV and deep blue
420alp lowpass
430alp lowpass
435drsp
435bp11 mercury or analytical instrument
440alp lowpass
460df30 DAPI Blue Ex
460alp lowpass
480bp9 blue absorp
485bp10
488df10 laser clean up
488nb1 argon laser
490df10 LED or argon cleanup
492bp10 cyan absorption for clinical analyzer
fb500-10
500asp
500bp11 cyan absorption
505df10
510df20
515asp
530af25 FITC E Omega, Fluorescein isothiocyanate
530alp lowpass
532sc0.9 doubled YAG, very narrow
535df55 Cy2
535rdf45 GFP, FITC Fluorescein isothiocyanate
535rdf100 CFP, GFP
540df20 FITC Fluorescein isothiocyanate
540alp lowpass
545aglp lowpass
549df8 mercury green
550bp10 mercury or analytical blk
550df20 TRITC Cy3 Em
554df10 barium, mercury or analytical instrument
555df19
573df10 yellow em.
575alp lowpass orange pass
577bp20 mercury block for Silicon 80 T
585aesp lowpass green omega
585df25
589bp10 sodium line block for silicon or PMT
589bp15 sodium line block for silicon or PMT; The 590 filter is for a resonant excitation of DBATT molecules in tetradecane (single molecule studies at cryogenic conditions) and the 758NB2 would be to acquire the resonance fluorescence of DBT (dibenzoterrylene) in Naphtalene.
590alp10 lowpass for 555nm LED fluorescence
595af60
610nm (30nm FWHM) laser optical interference
630bp10
632bp13
633bp10 He-Ne laser
637df56 He-Ne laser
647.6nm (50nm FWHM) laser optical interference, AVLIS
653bp10
655alp lowpass for 635nm LED fluorescence
660alp10 lowpass for 635nm LED fluorescence
675df20 HTRF with AR Omega
680df30 HTRF E Omega w/ AR, time-resolved fluorescence energy transfer
695alp10 lowpass for 665nm LED fluorescence
695aelp
700alp lowpass
710df40 IR LED cleanup
715df40 Cy5
715alp lowpass for PMT or CCD
720bp10
725alp lowpass, block for PMT or CCD
725aelp
733alp lowpass
750alp lowpass
760alp lowpass, block for PMT or CCD
770abp40 diode laser
780bp20 diode laser
780bp30 diode laser
780bp30 diode laser excited emission blk Si
780df15 diode laser block for Si
780df30 diode laser
785af30 diode laser
785bp15 diode laser
786bp15 diode laser
790bp35 diode laser excited emission blk Si
790bp40 diode laser excited emission blk Si
790bp45 diode laser excited emission blk Si
810bp10 IR laser block
810bp15 IR laser block
810wb20 IR laser block for Silicon 80 T
810bp200
830nb10 passband block for Silicon 70
830bp20 diode laser
850bp10
850sc0.8 filter is for isolating, resolving, and splitting the prominent line of Raman emission in the IR.
860df40 diode laser
900bp50
905ap20 diode laser APD detector TOF app
905bp10
905df40 diode laser
905af30 diode laser APD detector TOF app
905af50 diode InGaAs detector TOF app fast
915bp25 diode laser
945af25 diode laser APD detector TOF app
950bw35 IR plasma interference blocker
1064nb6
1160bp10
1550bp60 comm laser
1550sp comm laser reject
1850sp comm laser reject
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