MidOpt Bi685 Dark Red Interference Bandpass Filter
Bi685 is designed for use in certain aerial vegetative health monitoring applications. This filter isolates the 685nm wavelength range used in some red light vegetative health indices When plants are stressed or dying, photosynthesis slows down or stops. IR wavelengths are absorbed, while more visible light–particularly red light–is reflected.
Bi685 filters are also recommended for use with dark red laser diodes and LED lighting operating in the 680-690nm range, particularly in situations where ambient light can be overwhelming or separation from other red lighting wavelengths is needed.
MidOpt Bi685 Dark Red Interference Bandpass Filter Technical Characteristics
*Filters 62mm and greater have a surface quality tolerance of 60/40.
MidOpt Bi685 Dark Red Interference Bandpass Filter Transmission Chart
MidOpt Bi685 Dark Red Interference Bandpass Filter Transmission Data
MidOpt Bi685 Part Numbers:MidOpt Bi685-25.4
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|
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.