Midopt Machine Vision Filters


Midopt filters are the premier solution for industrial imaging to ensure flawless control, dependable results and the very best image quality. Every filter is produced with the highest standards in durability, so they can withstand even the harshest environments. Unlike traditional filters, Midopt filters are designed with a Gaussian transmission curve to allow maximum transmission, emulate the output of the most common LED wavelengths and are less angular dependent.

Some of the many industries Midopt serves include:

› Machine Vision/Factory Automation
› Security and surveillance
› License Plate Recognition/ITS
› Medical and life science
› Agricultural inspection
› Aerial imaging
› Motion analysis
› Photography and Cinematography

Our complete line of mounted, single substrate, hard coated filters are specifically created for industrial machine vision applications.
Our coatings:
• are extremely durable
• are non-hydroscopic
• withstand repeated cleaning with solvents
• withstand high heat, humidity, and vibration
• have an almost unlimited lifespan
Filters originally developed for photography are not readily adaptable for machine vision imaging.
MidOpt’s machine vision filters increase the contrast of the subject under inspection to create a more robust image.
Our filters are designed to work with a wide variety of lighting: monochromatic or white LED, fiber optic, diode etc
Mounts Available
Standard Threaded Mounts
Each filter is stocked in 16 standard sizes (22.5mm to 62mm) for same- or next-day shipping. Larger filters (67mm to 105mm) are made to order and are normally not returnable.
Standard Mounts .pdf
Slip Mounts
When your lens has no thread, slip Mounts attach a regular filter to the front of a lens, or they can attach a very large filter to accommodate a wide angle lens and prevent vignetting. Contact us to discuss the mount that best fit your lens’ outside diameter.
Slip Mounts .pdf
C/CS-Mounts
This threaded mount screws into any C- or CS-mount camera so the filter is positioned directly in front of the sensor. For applications with tight mechanical constraints.

C Mount .pdf

Filter List

Visible Bandpass Filters

These filters allow you to selectively control what your camera sees and are ideal for LED or laser diode use. Far more rugged, thinner, less angle-sensitive, with much higher transmission and far lower in cost compared to conventional interference filters, they greatly improve contrast and eliminate the need for a costly light shroud.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
BP470 Blue Bandpass – blue LEDS/UV fluorescence
BP485 Absorptive Visible Bandpass/Near-IR Block Filter
BP500 Green-Blue Bandpass – [NR] rec: BP525 or SP585
BP505 Cyan Bandpass – for 505nm LED lighting
BP525 Light Green Bandpass – green LEDs/fluorescence
BP530 Green Bandpass – [NR] rec: BP525
BP550 Near IR/UV Block Visible Bandpass Filter
BP590 Orange Bandpass – amber/orange LEDs/UV fluorescence
BP635 Light Red Bandpass – high-power red LEDs
BP660 Dark Red Bandpass – darker red LEDs and structured laser diodes
INFRARED PASS – VISIBLE BLOCK

Filters for passing select infrared wavelength ranges. Infrared pass filters are considered mandatory for all near-infrared applications in order to block the visible wavelengths that negate the effects of seeing in the IR.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
LP695 IR Longpass – IR LED’s @ 720nm
LP715 IR Longpass – [NR] recommended: BP880
LP780 IR Longpass – IR diode lasers @ 810nm
LP830 IR Longpass – general IR +880nm IR LEDs
LP850 IR Longpass – [NR] rec: LP830
LP920 IR Dichroic Longpass – IR LEDs @ 940nm
LP1000 IR Longpass – IR Vidicon/InGaAs cameras
BP695 IR Bandpass – NIR fluorescence
BP735 IR Bandpass – IR LEDs @ 735nm
BP800 IR Bandpass – best choice if thin filter needed over sensor
BP850 IR Bandpass – high-power IR LEDs @ 850nm
BP880 IR Bandpass – IR LEDs @ 880nm
INFRARED BLOCK – VISIBLE PASS
Filters for blocking select infrared wavelength ranges. IR blocking filters are almost essential for color imaging.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
BP550 NIR-UV Block/Visible Pass – 400-700nm … all color applications where filtering is not provided with the camera’s sensor
SP645 Mid-Red/NIR Dichrioc Block – best IR/mid-red block
SP675 Deep Red/NIR Dichrioc Block – best IR/deep red block
SP700 Hot Mirror/NIR Dichroic Block – standard IR block, for use with monochrome cameras
SP705 Deep Red/NIR Block – [NR] rec: SP700 or SP730
SP730 Hot Mirror/NIR Colorless Block – standard IR blocking, for use with color cameras
SP785 R Dichroic Block (modified) – [NR]
POLARIZING
Neutral gray laminated glass filters transmit visible light in only one polarization plane and are used to suppress glare from specular surfaces. Available from stock are linear, circular and infrared polarizers in most sizes. Larger sizes, along with custom laser-cut and laminated glass and plastic sheet materials, are also available for polarizing all commonly used light sources.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
PR032 Rotating Linear Polarizer with locking screw – reduces glare in the visible spectrum; locks in position
PC052 Circular Polarizer – reduces glare; for autofocus or autoiris lenses; for visible spectrum applications
PI035 IR Linear Polarizer – reduces only infrared glare
PSxxx – Visible and IR Polarizing Sheets mount in front of lighting. Sheets are available in a range of sizes and thicknesses. Call us with your specific needs.
NEUTRAL DENSITY

ND/NI filters are used to reduce luminous intensity without affecting color. Different optical densities (ODs) equate to an overall decrease in luminous transmission. Other optical densities are available on request.
Absorptive ND Filters for Visible (400-700nm) Applications
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
ND030 OD = 0.3 (T = 50%) – reduces light intensity
ND060 OD = 0.6 (T = 25%) – reduces light intensity
ND090 OD = 0.9 (T = 12.5%) – reduces light intensity
ND120 OD = 1.2 (T = 6.3%) – for viewing into lamps
NDxxx Call to discuss custom optical densities
Low-Reflectivity ND Filters for
Visible/Near-IR (350-1100nm) Applications
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
NI030 OD = 0.3 (T = 50%) – reduces light intensity
NI060 OD = 0.6 (T = 25%) – reduces light intensity
NI090 OD = 0.9 (T = 12.5%) – reduces light intensity
NI120 OD = 1.2 (T = 6.3%) – for viewing into lamps
UV BANDPASS
Filters are stocked for both passing and blocking select ultraviolet wavelength ranges. It is important to use UV pass/visible block filters in applications that actually involve imaging at UV wavelengths.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
BP250 Broadband UV Bandpass – deep broadband UV imaging
BP324 UV ‘A+B’ Bandpass – mid- to near-UV imaging
BP365 – Blacklite/UV ‘A’ Bandpass – UV imaging/UV lighting dichroic filter… NEW – NOW PASSES 395nm
BP435 Deep Blue/UV Bandpass –[NR] rec: BP470
LONGPASS COLOR
Longpass filters let longer visible and infrared wavelengths pass while blocking the shorter ones. Useful for improving contrast, resolution and separating colors in black/white or color applications. Typically not recommended for machine vision unless blocking of multiple wavelengths is necessary.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
LP470 Light Yellow Longpass – [NR] recommended: BP505
LP500 Yellow Longpass – blocks most blue and UV wavelengths
LP515 Yellow-Orange Longpass – blocks all blue and UV
LP530 Orange Longpass – [NR] rec: BP595
LP550 Orange Longpass – [NR] rec: BP595
LP580 Red-Orange Longpass – [NR] rec: BP595 or BP635
LP590 Red Longpass – [NR] rec: BP635
LP610 Red Longpass – [NR] rec: BP635
LP630 Red Longpass – [NR] rec: BP660
LP645 Dark Red Longpass – [NR] rec: BP660
SHORTPASS/NOTCH COLOR
Shortpass filters let shorter (bluer) visible and infrared wavelengths pass while blocking the longer ones. Useful for improving contrast, resolution and separating colors in black/white or color applications. Typically not recommended for machine vision unless blocking of multiple wavelengths is necessary.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
SP510 Blue Dichroic Shortpass – for sorting gold from silver or plated metal parts
SP570 Blue-Green Dichroic Shortpass – blocks orange to NIR
SP585 Cyan Dichroic Shortpass – blocks red and very near IR
SP625 Blue-Orange Dichroic Shortpass – blocks deep red/NIR
NF550 Magenta Dichroic Shortpass – blocks green while passing blue and red wavelengths
WHITE LIGHT BALANCING
Corrects artificial white lighting so colors appear more natural. LA series (amber) reduce blue shading often strongly dominant in white LED, Xenon strobe and metal halide lighting. LB series (blue) reduce the red in tungsten and halogen lighting. FL series fluorescent lighting filters and other wavelength enhancing filters are available.
Specifications
[NR] = not recommended for machine vision applications
Filter No. Filter name/Application
LA080 Minus Blue – [NR]
LA120 Minus Blue + – removes blue cast from white LED and metal halide lighting
LB080 Minus Red – removes yellow cast from halogen lighting
LB120 Minus Red + – [NR]
FL550 Minus Green – removes green cast from fluourescent