T:  1 (800) 762-1570  /  1 (416) 674-2804

Midwest Optical Systems, headquartered in Palatine, Illinois, has 30 years of experience and innovation in the fields of optical design, fabrication and inspection. MidOpt is a worldwide leader in machine vision filters and optical solutions. They are represented in over 30 countries and offer over 3,000 cutting-edge products.






MidOpt Bandpass Filters are specially designed for industrial imaging —

• Available in UV, VIS and NIR passbands

• Achieve optimal contrast

• Improve system control, repeatability and stability

• Block interfering wavelengths, eliminating the need for shrouds

• Increase resolution by reducing chromatic aberration

• Anti-reflection coated for maximum transmission

• Hard coated, single substrate fabrication

• Exceptional surface quality; 40/20 scratch/dig


MidOpt Dual Bandpass and Triple Bandpass Filters are most commonly used for security and surveillance, intelligent traffic solutions and Normalized Difference Vegetation Index (NDVI) imaging.

• 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

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.

• 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

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.

• 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

*Peak Transmission SP701 = 85%, SP705 = 88%

SP Series – VIS Pass

• Separate colors in monochrome or color applications

• Improve contrast and resolution

SP Series – Near-IR Block

• 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

MidOpt Neutral Density Filters 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.

• Available in a variety of optical densities

• Reduce light intensity while maintaining a wide aperture and shallow depth of field. Every 0.3 density increment equals one f-stop

• Minimize pixel saturation

• Can be stacked with other Neutral Density Filters to test various optical densities

• Exceptional surface quality; 40/20 scratch/dig

ND Series – Visible (VIS) Spectrum

• Absorptive filter effective from 425-675nm

• Available in optical densities ranging from 0.10-6.0

Ni Series – Broad Spectrum; VIS/NIR

• Low reflectivity filter effective from 400-2000nm

• Available in optical densities ranging from 0.3-2.0

• Coated on low-expansion, heat-resistant Borofloat® glass





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.

*Please specify the axis of polarization direction when inquiring about film

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

Protective Filters are designed to shield your lens and lighting from dirt, dust, liquids, impact and harsh environments without sacrificing image quality.

• 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

For information about Midopt products please contact Bock Optronics at 416-674-2804 or email us at info@bockoptronics.ca


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.

• 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

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.

• 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

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.