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As a provider of machine vision components, Voltrium Systems also provides a wide range of filters such as bandpass, dual bandpass, longpass, shortpass/nir cut, polarizing, neutral density, protective, color balancing.
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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. Security, surveillance, scientific, medical and other markets are also served.
Image quality begins with MidOpt filters (Made in the USA), our team and global distribution network can help solve problems and service your needs quickly. 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.
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Bandpass Filters
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.
Model |
Description |
Useful Range |
BP635 |
Light Red Bandpass Filter |
610-650nm |
BP660 |
Dark Red Bandpass Filter |
640-680nm |
BP470 |
Blue Bandpass Filter |
425-495nm |
BN650 |
Narrow Red Bandpass Filter |
638-672nm |
BN940 |
Narrow Near-IR Bandpass Filter |
920-955nm |
Bi405 |
Blue Interference Bandpass Filter |
390-410nm |
Bi660 |
Dark Red Interference Bandpass Filter |
650-665nm |
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Dual Bandpass Filters
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.
Model |
Description |
Useful Range |
DB475/850 |
Dual Bandpass Filter Visible Blue + NIR |
455-495nm, 830-875nm |
DB660/850 |
Dual Bandpass Filter Visible Red + NIR |
645-675nm, 830-870nm |
DB735 |
Dual Bandpass Filter Visible + 735nm NIR |
405-645nm, 725-755nm |
DB850 |
Dual Bandpass Filter Visible + 850nm NIR |
405-645nm, 835-875nm |
DB940 |
Dual Bandpass Filter Visible + 940nm NIR |
405-650nm, 925-965nm |
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Longpass Filters
Longpass filters let longer visible and/or infrared wavelengths pass while blocking shorter wavelengths of light. Mainly for use in monochrome (black and white) imaging applications, they can help to improve contrast, resolution and separate colors while maximizing brightness of surroundings in the vicinity of the subject under inspection or surveillance.
Model |
Description |
Useful Range |
LP285 |
High Trans. Heat Resistant VIS-NIR A/R Protective Window |
385-1100nm |
LP390 |
UV Absorbing Protective Window |
420-1100nm |
LP500 |
Yellow Longpass Filter |
510-1100nm |
LP590 |
Red Longpass Filter |
605-1100nm |
LP800 |
Near-IR Longpass Filter |
820-1100nm |
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Shortpass / NIR Cut Filters
Shortpass filters are useful for improving contrast, resolution and separating colors in black and white or color applications.
Model |
Description |
Useful Range |
SP510 |
Blue Shortpass Filter |
340-500nm |
SP585 |
Cyan Shortpass Filter |
395-575nm |
SP625 |
Blue-Orange Shortpass Filter |
425-620nm |
SP650 |
Near-IR/Mid-Red Dichroic Block Shortpass Filter |
400-640nm |
SP785 |
Modified Near-IR Dichroic Block Shortpass Filter |
425-770nm |
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Polarizing Filters
Polarizing filters reduce unwanted reflection or specular glare and can also be used to check stress patterns in transparent glass and plastic.
Model |
Description |
Useful Range |
PS007 |
High Contrast Linear Polarizer Film .007″ thk |
400-700nm |
PS030 |
Ultra High Contrast Linear Polarizer Film .030″ thk |
400-700nm |
PG120 |
Ultra High Contrast Glass Linear Polarizer Sheet |
400-700nm |
PR120 |
Ultra High Contrast Linear Polarizer |
400-700nm |
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Neutral Density Filters
Sunglasses for your system, ND filters reduce light intensity without affecting apparent color. They also allow for longer exposure times and reduced depth of field by using a wider iris opening, thus improving the separation of subject matter from background information.
Model |
Description |
Useful Range |
ND060 |
Neutral Density Filter – Absorptive 25% Transmission |
425-675nm |
ND300 |
Neutral Density Filter – Absorptive 0.1% Transmission |
425-675nm |
Ni030 |
Neutral Density Filter – Low Reflectivity 50% Transmission |
400-1100nm |
Ni120 |
Neutral Density Filter – Low Reflectivity 6.25% Transmission |
400-1100nm |
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Protective Filters
Available in glass or acrylic substrates, protective filters shield lenses and lighting from impact, dust and harsh environments – while blocking shorter UV wavelengths.
Model |
Description |
Useful Range |
LP285 |
High Trans. Heat Resistant VIS-NIR A/R Protective Window |
385-1100nm |
LP390 |
UV Absorbing Protective Window |
420-1100nm |
AC685 |
Acrylic NIR Longpass Filter |
710-1100nm |
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Color Balancing Filters
Corrects apparent color and contrast introduced by artificial white lighting, restoring natural colors. Used to modify the color balance in LED, fluorescent, halogen, metal halide, tungsten, and other white lighting, making colors appear more natural.
Model |
Description |
Useful Range |
LA080 |
Color Balancing Filter (Minus Blue) |
400-700nm |
LA120 |
Color Balancing Filter (Minus Blue) |
400-700nm |
LB080 |
Color Balancing Filter (Minus Red) |
400-700nm |
LB120 |
Color Balancing Filter (Minus Red) |
400-700nm |
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