MidOpt Filters
A manufacturer of custom precision optical components and systems since 1988, Midwest Optical Systems (MidOpt) is the world’s leading resource for off-the-shelf and custom machine vision filters, lenses and accessories used in industrial imaging applications.
MidOpt has an extensive history in optical component design, fabrication and inspection, and continues to develop innovative new products for industrial vision and CCTV end users.
MidOpt Product Guide | StableEdge |
MidOpt UAV Filters pdf | Backlight FloureSHEET pdf |
Filter Types
Bandpass Filters
For Industrial Applications: Improve Contrast and Repeatability
Specially designed for industrial imaging, MidOpt Bandpass Filters are the simplest, quickest and most cost-effective way to improve the image contrast, repeatability, and long term stability of any industrial vision system.
Definition:
A bandpass filter transmits a specific portion of the spectrum while blocking shorter and longer wavelengths. Increasing signal-to-noise results in improved contrast and better control over changes that may occur over time in ambient lighting conditions.
In the case of bandpass filters, “broad” and “rugged” are necessary in most machine vision applications. This allows for use with wide angle lenses and for variations in the spectral output of LEDs and laser diodes, while providing environmental stability and mechanical durability.
MidOpt Bandpass Filters are divided into Three Series:
- BP Series – Broad Bandwidth. For standard machine vision and surveillance applications
- BN Series – Narrow Bandwidth. For outdoor applications or situations involving overwhelming ambient light
- Bi Series – Narrow Interference Bandwidth. For laser diode or other narrow spectrum light source applications
Useful for
Industrial inspection, security, traffic control, medical and forensic applications
Multi Bandpass Filter
For Day/Night Color Camera Applications
Dual Bandpass Filters are ideal for applications that use a color camera during the day and IR illumination at night – ensuring that clear, accurate images are acquired under all lighting conditions.
Definition:
A dual bandpass filter transmits two specific wavelength ranges while blocking shorter and longer wavelengths as well as some middle portion of the spectrum. While triple bandwidth transmits three specific wavelengths ranges.
These filters in particular pass visible light and some smaller portion of the near-infrared spectrum. Blocking most of the near infrared allows for excellent color rendition while retaining the ability to pass a specific LED or laser diode wavelength used for night time illumination.
Multi Bandpass Filters
DB Series – Dual Bandwidth
Color | Part # | Description | Wavelength Range | FWHM |
---|---|---|---|---|
DB395/870 | Dual BP Absorptive Visible + NIR | 375-425nm, 745-970nm | 110nm, 375nm | |
DB475/850 | Dual Bandpass Blue + 850nm NIR | 460-490nm, 830-870nm | 45nm, 55nm | |
DB550/850 | Dual BP Visible Red + NIR | 460-490nm, 830-870nm | 45nm, 55nm | |
DB660/850 | Dual BP Visible Red + NIR | 645-675nm, 830-870nm | 40nm, 55nm | |
DB735 | Dual BP Visible + 735nm NIR | 405-645nm, 725-755nm | 250nm, 50nm | |
DB850 | Dual BP Visible + 850nm NIR | 405-645nm, 835-875nm | 250nm,50nm | |
DB940 | Dual BP Visible + 940nm NIR | 405-650nm, 925-965nm | 250nm,60nm |
Visible + IR : One Filter, Double the Work
Most commonly used for security and surveillance, intelligent traffic solutions and Normalized Difference Vegetation Index (NDVI) imaging.
These filters pass visible light and a narrow IR band that make viewing with commensurate IR illumination possible at night.
TB Series – Triple Bandwidth
Color | Part # | Description | Wavelength Range | FWHM |
---|---|---|---|---|
TB475/550/850 | Triple Bandpass Blue + Green +850nm NIR | 468-483nm, 543-558nm,
835-865nm |
20nm,20nm, 40nm | |
TB550/660/850 | Triple Bandpass Blue + Red +850nm NIR | 542.5-557.5nm,
652.5-667.5nm, 835-8650nm |
20nm, 20nm, 40nm |
Features
- Pass visible light and a specific portion of the visible (VIS) and near-infrared (NIR) spectrums
- Ideal for color camera applications that utilize daytime sunlight and NIR illumination at night
- Achieve accurate color rendition by blocking interfering wavelengths
- Eliminate the need for dual sensor imaging
- Anti-reflection coated for maximum transmission
- Hard-coated, single-substrate fabrication
- Exceptional surface quality; 40/20 scratch/dig
Applications
Dual Bandpass Filters are becoming increasingly popular in NDVI aerial drone inspection, allowing for single sensor imaging and reduced operation payload. NDVI, traditionally achieved by satellite imagery, can now be obtained utilizing Dual Bandpass Filters and personal aerial imaging devices.
General Availability
- Threaded, C/CS, Slip, Unmounted
- Threaded mount sizes in M22.5 up to M82
- Custom sizes and shapes available
Longpass Filter
For Monochrome Applications: Improve Contrast
Often referred to as a “sharp-cut” filter, Longpass Filters are specifically designed to pass a broad spectrum of longer wavelength light while blocking shorter wavelengths.
Definition:
Longpass filters transmit wavelengths longer than the specified cut-on wavelength while blocking shorter wavelengths. They are usually used in monochromatic applications to improve contrast, where like colors will lighten like colors. Most MidOpt longpass filters are absorptive rather than dichroic (reflective), making them well suited for wide angle applications.
Color | Part # | Description | Wavelength Range | Cut-on Wavelength 50% T |
---|---|---|---|---|
LP Series – Protective Filters | ||||
LP170 | Fused Sliica Protective Window | 200-230nm | ||
LP171 | Fused Silica MMulti-layer VIS A/R Coated Protective Winwo | 380-900nm | ||
LP190 | Sapphire Protective Window | 250-2300nm | ||
LP285 | High Trans. Heat Resistant VIS-NIR A/R Protective Window | 385-1100nm | 285nm | |
LP286 | Borofloat Oleophobiv VIS A/R Coated Protective Window | 350-1100nm | 340nm | |
LP330 | Protective Window | 340-1100nm | 330nm | |
LP340 | A/R Protective Window | 390-800nm | 340nm | |
LP341 | Industrial Grade Oleophobic VIS A/R Coated Glass Protective Window | 365-1100nm | 335nm | |
LP345 | Precision Multi-Layer VIS A/R Coated Glass Protective WiNDOW | 350-800NM | 340nm | |
LP347 | New Near-IR A/R Coated Glass Protective Window | 690-1090nm | 360nm | |
LP389 | New Precision Multi-Layer VIS + NIR A/R Coated Glass Protective Window | 400-1100nm | 380nm | |
LP390 | UV Absorbing Protective Window | 420-1100nm | 390nm | |
LP415 | UV Block | 420-1100nm | 415nm | |
LP418 | UV Block A/R Protective Window | 425-1100nm | 418nm | |
LP8000 | New Germanium DLC Coated LWIR Protective Window | 7500-12500nm | 5235nm | |
LP Series – Longpass | ||||
LP470 | Light Yellow Longpass | 480-1100nm | 470nm | |
LP500 | Yellow Longpass | 510-1100nm | 500nm | |
LP515 | Yellow-Orange Longpass | 520-1100nm | 515nm | |
LP530 | Orange Longpass | 545-1100nm | 530nm | |
LP550 | Orange Longpass | 560-1100nm | 550nm | |
LP580 | Red-Orange Longpass | 585-1100nm | 580nm | |
LP590 | Red Longpass | 605-1100nm | 590nm | |
LP610 | Red Longpass | 620-1100nm | 610nm | |
LP630 | Red Longpass | 645-1100nm | 630nm | |
LP645 | Dark Red Longpass | 650-1100nm | 645nm | |
LP665 | Dark Red Longpass | 680-1100nm | 665nm | |
LP695 | NIR Longpass | 715-1100nm | 695nm | |
LP715 | NIR Longpass | 730-1100nm | 715nm | |
LP780 | NIR Longpass | 800-1100nm | 800nm | |
LP800 | NIR Longpass | 820-1100nm | 800nm | |
LP815 | NIR Longpass | 825-1100nm | 815nm | |
LP830 | NIR Longpass | 845-1100nm | 830nm | |
LP850 | NIR Longpass | 870-1100nm | 850nm | |
LP900 | NIR Longpass (Limited) | 910-1100nm | N/A | |
LP920 | NIR Longpass | 930-1100nm | 920nm | |
LP1000 | NIR Longpass | 1010-1100nm | 1000nm | |
LP1070 | SWIR Longpass | 1100-2300nm | 1070nm | |
LP1475 | SWIR Longpass | 1490-2300nm | 1475nm | |
LP1475A | SWIR Longpass / Ext. VIS Block | 1490-2300nm | 1475nm | |
LP1850 | SWIR Longpass | 1900-12000nm | 1850nm |
Features
- Economical solution for isolating specific spectral regions
- Peak transmission ≥90%
- StablEDGE® design reduces angular dependency and minimizes short-shifting effects
- Anti-reflection coated for maximum transmission in VIS and NIR spectrums
- Can be used with Shortpass Filters for a custom, fine-tuned Bandpass Filter
- Double-side polished glass for exceptional parallelism and optical flatness
- Exceptional surface quality; 40/20 scratch/dig
- Available in wavelength ranges from 350nm to 1500nm
Applications
Longpass Filters are often used in fluorescence applications to block an excitation light source or to pass multiple emission wavelengths, improving signal to noise ratio. Longpass Filters are also commonly used in photography and astronomy.
General Availability
- VIS/IR wavelengths
- Mounting Options: Threaded, C/CS, Slip, Unmounted
- Threaded mount sizes: M25.5 up to M105
Shortpass / NIR Cut Filters
For Color or Black and White Applications
Often thought of as “IR-cut” filters, Shortpass Filters are specifically designed to pass a broad spectrum of shorter wavelength light, while blocking longer visible (VIS) and near-infrared (NIR) wavelengths.
Definition:
Shortpass filters transmit wavelengths shorter than the specified cut-off wavelength while blocking longer wavelengths. Perhaps the best example of this is the infrared blocking filter that is typically found in a color camera. In order to achieve accurate color rendition, this filter blocks longer wavelength infrared light and passes shorter wavelength visible light.
SP – Series – VIS Pass
- Separate colors in monochrome or color applications
- Improve contrast and resolution
Color | Part # | Description | Wavelength Range | Cut-off Wavelenghth 50% T |
---|---|---|---|---|
SP651 | New SP651 Near-UV/Visible Pass and Near-IR/Mid-Red Dichroic Block Shortpass Filter | 350-645 nm | 645nm | |
SP510 | Blue Shortpass Filter | 340-500nm | 510nm | |
SP570 | Blue Green Shortpass Filter | 410-560nm | 570nm | |
SP585 | Cyan Shortpass Filter | 395-575-620nm | 585nm | |
NF550 | Magenta Dichroic (Green Block) | 395-475nm, 605-700nm | 480/ 590nm | |
SP713 | New Extended Hot Mirror / Reflects up to 1300nm | 420-695nm | 400/700nm (cut-on/cut-off) |
SP Series – NIR Block/VIS Pass
- Commonly placed over the camera’s image sensor to block NIR light and achieve natural color rendition
- Used as a hot mirror to reduce unwanted heat build-up caused by IR radiation
Color | Part # | Description | Wavelength Range | Cut-off Wavelenghth 50% T |
---|---|---|---|---|
SP625 | Blue-Orange Short Pass Filter | 425-620nm | 625nm | |
SP635 | Absorptive Visible Shortpass/Near-IR Block Filter | 395-638nm | 635nm | |
SP644 | Near-IR/MId-Red Dichroic Block Shortpass Filter | 400-640nm | 648nm | |
SP645 | NIR/Mid-Red Dichroic Block | 400-640nm | 645nm | |
SP650 | NIR.Mid-Red Dichroic Block | 400-640nm | 650nm | |
SP675 | NIR/Deep Red Dichroic Block | 420-660nm | 675nm | |
SP700 | NIR/UV Block-Visible Bandpass | 410-690nm | 400/700nm | |
SP701 | Extended Hot Mirror/Reflects up to 1550nm | 410-690nm | 400/700nm | |
SP705 | NIR/Deep Red Absorp. Block | 370-630nm | 705nm | |
SP713 | Extended Hot Mirror/Reflects up to 11300nm | 420-695nm | 400/700nm(cut-on /cut-off | |
SP730 | NIR/Colorless Dichroic Block | 400-720nm | 730nm | |
SP785 | Modified NIR Dichroic Block | 425-770nm | 785nm |
Visible Imaging
Shortpass filters usually transition sharply from shorter wavelength transmission to reflecting longer wavelengths of light
Infrared Imaging
Several Shortpass filter types are offered which block varying amounts of visible and near-infrared light above and below 700nm. The choice of the best filter for any application is often based on the spectral characteristics of the camera sensor.
Features
- Designed to have a sharp transition between shorter wavelengths (which are passed) and longer wavelengths (which are blocked)
- Peak transmission ≥90%*
- Can be used with Longpass Filters for a custom, fine-tuned Bandpass Filter
- Anti-reflection coated for maximum transmission
- Exceptional surface quality; 40/20 scratch/dig
- Available in wavelength ranges from 340nm to 785nm
Applications
Shortpass Filters are commonly used in color imaging to achieve natural color rendering. They can also be used to protect the sensor from NIR laser damage or to reduce IR radiation or “camera bloom” created during hot metal or glass extrusion processes.
General Availability
- VIS/IR wavelengths
- Mounting Options: Threaded, C/CS, Slip, Unmounted
- Threaded Sizes: M25.5 up to M105
Neutral Density
For Light Intensity Reduction
Serves as “sunglasses” for your system and can be used with monochrome or color cameras. Designed to reduce light intensity neutrally over a specific wavelength range without affecting image color or contrast.
Definition:
Neutral density filters reduce transmission uniformly over a specific portion of the spectrum. They are defined according to their Optical Density (OD). The higher the OD, the lower the transmission. These filters can be stacked to create filters with custom ODs. They are useful when trying to image extremely bright subjects or when trying to provide separation of subject matter from background by reducing depth of field.
ND Series – VIS, Absorptive
- Absorptive filter effective from 425-675nm
- Available in optical densities ranging from 0.10-6.0
Color | Part # | Description | Wavelength Range | Optical Density |
ND030 | Absorptive 50% Transmission | 425-675nm | 0.3 | |
ND060 | Absorptive 25% Transmission | 425-675nm | 0.6 | |
ND090 | Absorptive 12.5% Trans. | 425-675nm | 0.9 | |
ND120 | Absorptive 6.25% Trans. | 425-675nm | 1.2 | |
ND200 | Absorptive 1.0% Transmission | 425-675nm | 2.0 | |
ND300 | Absorptive 0.1% Transmission | 425-675nm | 3.0 | |
ND400 | Absorptive 0.1% Transmission | 425-675nm | 4.0 |
Ni Series – VIS/NIR, Low-Reflectivity
- Low reflectivity filter effective from 400-1100nm
- Available in optical densities ranging from 0.3-1.2
- Coated on low-expansion, heat-resistant Borofloat® glass
Color | Part # | Description | Wavelength Range | Optical Density |
---|---|---|---|---|
Ni030 | ND, Low Refl. OD = 0.3 (50% trans.) | 400-1100nm | 0.3 | |
Ni060 | ND, Low Refl. OD = 0.6 (25% trans.) | 400-1100nm | 0.6 | |
Ni090 | ND, Low Refl. OD = 0.9 (12.5% trans.) | 400-1100nm | 0.9 | |
Ni120 | ND, Low Refl. OD = 1.2 (6.25% trans.) | 400-1100nm | 1.2 | |
Ni200 | ND, Low Refl. OD = 1% | 400-200nm | 2.0 |
Features
- Available in various optical densities
- Used with monochrome or color cameras operating in the visible and/0r near-IR spectrums
- Includes identical male and female filter threads on either end for stacking
- The sum of the OD’s density of two or more filters stacked together equals the total density
-
Ni filters are unique in maintaining exceptional spectral neutrality over the full visible-to-near-IR range while greatly limiting undesirable back reflections over that same range.
- Excellent parallelism, optical flatness and surface quality
- Custom densities available upon request
- Useful for: attenuating bright light; exposure control of images; system protection for low power laser applications
Applications
Applications include imaging in intense lighting situations (i.e. molten metal and welding), outdoor aerial imaging and photography. Neutral Density Filters help reduce shutter speed to create blur, preventing a “jello” effect in aerial imaging.
General Availability
- UV/VIS/NIR
- Mounting Options: Threaded, C/CS, Slip, Unmounted
- Threaded sizes: M22.5 – M105
- Custom shapes and sizes available
Polarizing Filters
For Glare and Reflection Reduction
Polarizers are designed to reduce specular glare by passing only the light polarized in the direction perpendicular to the reflected light (glare). In addition, they help improve contrast, increase color saturation and detect imperfections in transparent materials. MidOpt Polarizing Filters can be easily and securely mounted to your lens and light source for maximum extinction or glare reduction.
Definition:
Light reflected from a non-metallic surface becomes polarized, sometimes to the degree that a strong glare is created. A linear polarizer rotated to pass only light polarized in the direction perpendicular to the reflected light (the glare) will absorb much of it. Aside from reducing reflections, polarizers help to improve contrast by reducing dynamic range, allow for evaluation of stress in transparent plastic and glass, and can be used in pairs to form a variable neutral density filter.
Acrylic Polarizers
Color | Part # | Description | Wavelength Range | Contrast Ratio |
PA371 | New Ultra-High Contrast Oleophobic Coated Acrylic Liner Polarizer | 400-700nm | 10,000:1 | |
PA385 | New Ultra-High Contrast Cell Cast Acrylic Linear Polarizer | 400-700nm | 10,000:1 | |
PA401 | New Ultra-High Contrast Oleophobic Coated Acrylic Linear Polarizer | 400-700nm | 10,000:1 | |
PA1000 | New VIS/NIR Wire Grid Oleophobic Coated Acrylic Linear Polarizer Window | 400-700nm | 10,000:1 |
Polarizing Filters
Color | Part # | Description | Wavelength Range | Contrast Ratio |
PR032 | Linear Polarizer | 400-700nm | 800:1 | |
PR120 | Ultra High Contrast Linear Polarizer | 400-700nm | 6500:1 | |
PR1000 | PR1000 VIS/SWIR Wire Grid Linear Polarizer Mounted Filter | 400-2000nm | 8000:1 | |
PC052 | Circular Polarizer | 400-700nm | 700:1 | |
Pi031 | NIR/Vis Linear Polarizer, High Extinction | 400-2000nm | 300:1 | |
Pi035 | NIR/Vis Linear Polarizer, High Transmission | 400-2000nm | 500:1 | |
PG120 | PG120 High Temperature Ultra High Contrast Glass Linear Polarizer Filter 2.5mm thk | 400-700nm | 10,000:1 | |
PG1000 | PG1000 VIS/SWIR Wire Grid Linear Polarizer Unmounted Filter | 400-2000nm | Uo to 8000:1 |
Polarizing Filters
- Contrast ratios average up to 10,000:1
- Linear, circular and wire grid polarizers are available for visible (VIS) and near-infrared (NIR) spectrums
- Rotating mount with locking thumb screw to fine tune glare reduction
- Exceptional surface quality; 40/20 scratch/dig
Polarizing Film
Color | Part # | Description | Wavelength Range | Contrast Ratio |
PS007 | High Contrast Linear Polarizer | 400-700nm | 800:1 | |
PSA007 | High Contrast Linear Polarizer | 400-700nm | 1500:1 | |
PS010 | High Contrast Linear Polarizer | 400-700nm | 800:1 | |
PS030 | Ultra Contrast Linear Polarier | 400-700nm | 800:1 | |
PS1000 | PS1000 VIS/SWIR Wire Grid Linear Polarizer Film | 400-2000nm | Up to 8000:1 | |
PSA1000 | PSA1000 VIS/SWIR Wire Grid Linear Polarizer Film with Adhesive Back | 400-2000nm | Up to 8000:1 | |
HT025 | High Temp. Linear Polarizer | 400-700nm | 5000:1 | |
HT008 | High Temp. Linear Polarizer | 400-700nm | 10,00:1 | |
HTA008 | High Temp. Linear Polarizer | 400-700nm | 10,00:1 | |
Pi005 | NIR Contrast Linear Polarizer | 700-1100nm | 1000:1 |
Polarizing Film
- Achieves optimal glare reduction when placed over light source
- Contrast ratios average up to 10,000:1
- Linear polarizers are available for VIS and NIR requirements
- Left and right circular polarizers are available for VIS spectrum applications
- Offered in high-temperature-resistant laminate and glass
- PSA007 and HTA008 material comes standard with self-adhesive backing
MOUNT & SIZE OPTIONS: Polarizing Filters and Films are available from stock and are ready to ship. Polarizing Filters are available in Threaded Mounts, sizes M22.5 to M105; Slip Mounts; or Unmounted. Polarizing Films are available in multiple thicknesses, and can be custom laser cut to fit any light source with a maximum usable width of 16.5″ and length up to 300′.
Applications
Polarizers are commonly used to reduce glare from non-metallic in objects with smooth surfaces or surfaces covered with grease, oil or liquid. For best results, use an optical-grade Polarizer over the lens and Polarizing Film over the light source. The PR120/PG120 offers ultra-high contrast and an anti-reflection oleophobic coating.
General Availability
- Use with Linear & Circular polarizing film
- VIS or Near-IR wavelengths
- Mounting Options: Threaded, Slip, Unmounted
- Threaded Sizes: M22.5 – M105
Protective Filters
For Lens Shield and Short UV Block
Protective Filters are designed to shield your lens and lighting from dirt, dust, liquids, impact and harsh environments without sacrificing image quality.
Definition:
Protective Filters typically act as windows or dust covers for lenses, filters, sensors, cameras or lighting. Usually they will block a portion of the UV spectrum, although those used in infrared applications will often also block visible wavelengths.
- Economical solution to protect expensive lenses
- Useful for imaging in ultraviolet (UV), visible (VIS) and near-infrared (NIR) spectrums
- Available with a high-efficiency, anti-reflection coating to maximize transmission to 98% or more
- Offered in both glass and acrylic
- Exceptional surface quality; 40/20 scratch/dig
MOUNT & SIZE OPTIONS: In-stock, ready-to-ship Protective Filters are available in Threaded Mounts, sizes M13.25 to M105; 25.4® C-Mount; Slip Mounts; or Unmounted. Custom shapes and sizes are available.
PROTECTIVE FILTER APPLICATIONS:
Protective Filters are useful in all imaging applications. The LP285 can withstand high temperatures and is impact resistant (similar qualities to Pyrex).
AC Series – Acrylic Protective Longpass
Color | Part # | Description | Wavelength Range | Cut-On Wavelength 50% T |
---|---|---|---|---|
AC370 | Acrylic Oleophobic VIS A/R Coated Protective Window | 380-850nm | 370nm | |
AC380 | A/R Acrylic Protective Window | 400-850nm | 380nm | |
AC385 | New Hard -Coated Acrylic Protective Window | 390-1100nm | NA | |
AC389 | New Acrylic VIS + NIR A/R Coated Protective Window | 420-1100nm | ||
AC400 | AC400 Acrylic Oleophobic-Coated UV-Block Protective Window | 415-1100nm | 400nm |
LP Series – Lens Protection
Color | Part # | Description | Wavelength Range | Cut-On Wavelength 50% T |
---|---|---|---|---|
LP170 | Fused Silica Protective WindowF | 200-2300nm | NA | |
LP171 | Fused Silica Multi-Layer Vis A/R Coated Protective Window | 380-900nm | NA | |
LP190 | Sapphire Protective Window | 250-2300nm | NA | |
LP285 | New High Trans. Heat Resistant VIS-NIR A/R Protective Window | 385-1100nm | 285nm | |
LP286 | Borofloat® Oleophobic VIS A/R Coated Protective Window | 350-1100nm | NA | |
LP330 | Protective Window | 340-1100nm | 330nm | |
LP340 | A/R Protective Window | 390-800nm | 340nm | |
LP341 | Industrial-Grade Oleophobic VIS A/R Coated Glass Protective Window | 365-1100nm | 335nm | |
LP345 | Precision Multi-Layer Vis A/R Coated Glass Protective Window | 350-800nm | 340 nm | |
LP347 | Near_IR A/R Coated Glass protective Window | 690-1090nm | 360nm | |
LP389 | Precision Multi-Layer VIS + NIR A/R Coated Glass Protective Window | 400-100nm | 380nm | |
LP390 | UV Absorbing Protective Window | 420-1100nm | 390nm | |
LP415 | UV Block A/R Protective Window | 420-1100nm | 415nm | |
P8000 | Germanium DLC Coated LWIR Protective Window | 7500-12500nm | 5235nm |
Visible
- Acrylic or glass options ; anti-reflection coated or uncoated alternatives available
- Block UV wavelengths while simultaneously passing ≥90% of the visible and near-IR.
- Available in mounts or custom sizes up to 600mm (24”) dia.; can be provided with through-holes, tabs, or other features to aid in mounting.
Ultraviolet
- LP280 and LP330 will pass near-UV light, while other types block UV.
- Other materials not listed here are also available, please contact us with your specific requirements.
Infrared
- AC685, AC700 and AC760 acrylic materials are 2mm thick, shatter-resistant, and appear black; blocking visible light and passing near-IR wavelengths.
- Other listed materials pass visible light as well as the near-IR.
- Also available are materials that are not shown here. Please contact us if you have other special needs.
Applications
Protective Filters are useful in all imaging applications. The LP285 can withstand high temperatures and is impact resistant (similar qualities to Pyrex).
General Availability
- UV/VIS/IR
- LP Series Mounting Options: Threaded, C/CS, Slip, Unmounted
- AC Series Mounting Options: Threaded, Slip, Unmounted
- Threaded Sizes: M22.5 – M105
- Custom shapes and sizes available
Acrylic Filters
For Lens Shield and Short UV Block
Acrylic Longpass Filters are a durable, lightweight and economical solution for inspection windows. They can protect a lens in environments where broken glass might pose a problem.
AB Series – Acrylic Bandpass
Color | Part # | Description | Wavelength |
---|---|---|---|
AB555 | Acrylic Absorpitive Near-IR UV-Block Visible | 470-645nm, |
AC Series – Acrylic Longpass
Color | Part # | Description | Wavelength Range | Cut-On Wavelength 50% T |
---|---|---|---|---|
AC370 | Oleophobic A/R Acrylic Protective Window | 380-850nm | 380nm | |
AC380 | A/R Acrylic Protective Window | 450-850nm | 380nm | |
AC389 | New Acrylic VIS + NIR A/R Coated Protective Window | 420-1100nm | NA | |
New Acrylic Uncoated Protective Window | 390-1100nm | NA | ||
AC400 | AC400 Acrylic Oleophobic-Coated UV-Block Protective Window | 415-1100nm | 400nm | |
AC685 | A/R NIR Longpass Filter | 710-1100nm | 685nm | |
AC760 | A/R NIR Longpass Filter | 780-1100nm | 760nm | |
AC800 | A/R NIR Longpass Filter | 815-1100nm | 795nm | |
AC850 | A/R NIR Longpass Filter | 880-1100nm | 855nm | |
AC900 | A/R NIR Longpass Filter | 930-1100nm | 760nm | |
AC915 | Acrylic Short-Wave A/R Coated Infrared Longpass Filter | 960-1650nm; 1750-1890nm; 1925-2090nm | NA |
Features
- High transmission ranging from 90 to 98%
- Available with an anti-reflection coating for maximum transmission
- Optical-grade acrylic
- Impact-resistant
- Half the weight of glass
Applications
Acrylic Longpass Filters are frequently used for lens protection and economical enclosure windows, as well as over light sources to control the wavelength emission of broad spectrum light sources. Because of their durability, they’re commonly used in Food & Drug Administration (FDA) and European Food Safety Authority (EFSA) regulated applications where glass over the inspection area is not permitted. AC370 and AC380 offer anti-abrasion, anti-reflection coating, which can also withstand harsh solvents such as alcohol, acetone or MEK.
Diffuser
A diffuser can be any translucent material that scatters light, most commonly applied in the form of a panel or cover that is placed directly over a light source. Its main purpose is to diffuse (or “spread out”) light in a more uniform manner. It can help reduce the sharpness of shadows or greatly reduce harsh, unwanted glare. One common application is to eliminate lamp filament or LED “hot spots”, which can_at times be very intense. A diffuser is commonly used over LED lighting to distribute light output more evenly over a given area while also affording some protection for the LEDs.
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DF035 | New Acrylic Diffuser | .8mm | 35% | |
DF045 | New Acrylic Diffuser | 2mm | 45% | |
DF050 | New Acrylic Diffuser | 1.5mm | 50% | |
DF055 | New Acrylic Diffuser | 1mm | 55% | |
DF065 | New Acrylic Diffuser | 1mm | 65% | |
DF070 | New Acrylic Diffuser | 1mm | 70% | |
DF075 | New Acrylic Diffuser | 1mm | 75% | |
DF080 | New Acrylic Diffuser | 1mm | 80% | |
DF085 | New Acrylic Diffuser | 1mm | 85% | |
DF090 | New Acrylic Diffuser | 1mm | 90% | |
DF093 | New Acrylic Diffuser | 1mm | 93% |
Light Balancing Filters
For Color and Contrast Correction
Light Balancing Filters correct artificial lighting so colors appear more natural. These filters balance color, preventing the need for additional software processing. This allows for greater image stability and control.
Definition:
Light Balancing Filters are used to modify the color balance in LED, fluorescent, halogen, metal halide, tungsten, and other white lighting, making colors appear more natural. The LA series (Minus Blue) reduce blue shading that often strongly predominates in white LED and xenon strobe lighting. The LB series (Minus Red) reduces the red hue found with some tungsten and halogen lighting.
LA Series / LB Series / FL Series
Color | Part # | Description | Wavelength Range | Mired Shift Value |
---|---|---|---|---|
LA080 | Light Balancing (Minus Blue) | 400-700nm | -80 | |
LA120 | Light Balancing (Minus Blue) | 400-700nm | -120 | |
LB080 | Light Balancing (Minus Red) | 400-700nm | +80 | |
LB120 | Light Balancing (Minus Red) | 400-700nm | +120 | |
FL550 | Light Balancing (Minus Green) | 400-700nm | – |
Features
- Achieve accurate color images when using an artificial light source
- Increase contrast by correcting the emission spectrum of various light sources
- Exceptional surface quality; 40/20 scratch/dig
- LA series: Reduce blue shading (“warm” the scene) and commonly used with white LED and xenon strobe lighting
- LB series: Subdue the reddish hue found with some tungsten, halogen, sodium and other light sources
- FL series: Used to reduce the greenish cast created by fluorescent lighting
Applications
Commonly used in color applications (i.e. machine vision/factory automation, photography, and fluorescence imaging).
General Availability
- VIS wavelengths
- LA and LB Mounting Options: Threaded, C/CS, Slip, Unmounted
- FL550 Mounting Options: Threaded, Slip, Unmounted
- Custom shapes and sizes available
Backlight fluoreSHEET™
Achieve a backlight effect in space-constrained applications with MidOpt Backlight fluoreSHEET™
Backlights provide sharp contrast to outline a shape, edges or an opening. But applications with space constraints may dictate backlight utilization. MidOpt introduces the backlight fluoreSHEET™ (BF590). When the fluoreSHEET™ is illuminated from the front with a blue LED light, it emits an orange fluorescence. A backlight effect can be created by using a MidOpt Orange Bandpass Filter (BP590) to capture the orange emission and block the blue LED excitation, giving the appearance of a bright white diffuse background in a monochrome image.
- Adhesive Backing
- Repels water
- Tear-resistant
- Flexible
Available Sizes:
Image Results:
To achieve a backlight effect, pair the Backlight fluoreSHEET™ with MidOpt Orange Bandpass Filter
BP590 Orange Bandpass Filter
The BP590 Orange Bandpass Filter is necessary to capture the orange wavelength that is being emitted from the fluoreSHEET™, while blocking the blue excitation from the LED light source. The result is a bright white diffuse background similar to the effect of backlight illumination.