MidOpt BN940 Narrow Near-IR Bandpass Filter
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.
MidOpt BN940 Narrow Near-IR Bandpass Filter Technical Characteristics
*Filters 62mm and greater have a surface quality tolerance of 60/40.
MidOpt BN940 Narrow Near-IR Bandpass Filter Transmission Chart
MidOpt BN940 Narrow Near-IR Bandpass Filter Transmission Data
MidOpt BN940 Part Numbers:MidOpt BN940-25.4
MidOpt Filter Mounting Options
Midwest Optical Systems offers filters in the following standard mounts. Most filters have both male and female threads to enable the ability to stack filters. For specific questions, please contact Machine Vision Direct.
- Designed for lenses with filter threads, a variety of filter types and stock threaded sizes are available: M13.25-M105
- Larger sizes, 62mm to 105mm, are made to order and are not returnable
- Custom thread sizes are available upon request
- Black anodized aluminum rings
- Rotating mounts with locking thumb screws are available upon request and come standard with Polarizing Filters
How to Order
To order a filter with a threaded mount, first select a filter (e.g. BP470) and add the mount size (e.g. M27) to build your part number (e.g. BP470-27). For help building your filter part number, visit an individual filter page.
Thread Dia x Pitch
|Part Suffix||Outer Diameter||Clear Aperture|
|M13.25 x P0.5||-13.25||14.4||10.6|
|M22.5 x P0.5||-22.5||24||18.5|
|M25.5 x P0.5||-25.5||27.5||21|
|M27 x P0.5||-27||29||22.5|
|M30.5 x P0.5||-30.5||32.5||25.5|
|M34 x P0.5||-34||36||29|
|M35.5 x P0.5||-35.5||37.5||30.5|
|M37 x P0.75||-37||39||31.9|
|M37.5 x P0.5||-37.5||39.5||32.5|
|M39 x P0.5||-39||41||34|
|M40.5 x P0.5||-40.5||42.5||35.5|
|M43 x P0.75||-43||45||38|
|M46 x P0.75||-46||48||41|
|M48 x P0.75||-48||50||43|
|M49 x P0.75||-49||51||44|
|M52 x P0.75||-52||54||47|
|M55 x P0.75||-55||57||50|
|M58 x P0.75||-58||60||52.9|
|M62 x P0.75||-62||64||57.1|
|M67 x P0.75||-67||70||61.8|
|M72 x P0.75||-72||75||66.9|
|M77 x P0.75||-77||80||71.9|
|M82 x P0.75||-82||85||76.8|
|M86 x P1.0||-86||89||80.8|
|M95 x P1.0||-95||98.2||89.9|
|M105 x P1.0||-105||109.8||100|
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