Bandpass Lens Filter 465nm, Select your size, 465 nm peak wavelength, useful range between 435-495 nm, useful range FWHM: 60 (±5 nm)

The BP465 narrow bandpass filter is an advanced lens filter designed to pass light with a peak wavelength of 465 nm and a useful range between 435–495 nm, while blocking all other wavelengths.

It can be mounted on a machine vision lens using the standard filter thread.

Multiple thread size options allow you to match your specific lens requirements, guaranteeing a stable mount and consistent optical performance across diverse machine vision applications.

How the BP465 Narrow Bandpass Filter Works

Narrow bandpass filters work by allowing only a specific portion of the light spectrum to pass while blocking all other wavelengths.

For the BP465 filter, light near 465 nm passes through with peak transmission above 90%, and the useful range between 435–495 nm maintains transmission above 80%. 

Specification
Filter type	Narrow Bandpass
Peak wavelength	465 nm
Peak wavelength color	Blue
Useful wavelength range	435-495 nm

Available sizes for Our BP465 lens filter

Because lenses come in different sizes, the BP465 filter is offered in several common thread options so it can match both compact and larger lenses:

• C-mount filter

• 0.5 thread (pitch): M22.5×0.5, M25.5×0.5, M27×0.5, M30.5×0.5, M34×0.5, M35.5×0.5, M37×0.5, M37.5×0.5, M40.5×0.5

• 0.75 thread (pitch): M37×0.75, M43×0.75, M46×0.75, M49×0.75, M52×0.75, M55×0.75, M58×0.75, M60×0.75, M62×0.75, M67×0.75, M72×0.75

Need info on using a C-mount (CMT) filter thread?

Submit the form below to get instant access to the manual on how to mount it and see which lenses it’s compatible with!

BP465 Narrow Bandpass Filter: Technical Overview and Practical Applications

The BP465 bandpass filter is designed to transmit light centered around 465 nm while blocking unwanted wavelengths outside its passband. This precise wavelength control enhances image contrast, color accuracy, and measurement reliability for a wide variety of optical systems.

By selecting a specific wavelength (for example 465 nm), the BP465 filter effectively becomes a ‘color’ filter for the monochrome imaging: it allows only the target color (blue) to pass and suppresses its complementary and nearby wavelengths. Adding a color lens filter “works on a subtraction idea” — for instance, a blue filter makes blue shades stay bright while rendering complementary colors dark.

In practice, when you combine a white-light or other broad-spectrum source with a BP465 filter, you isolate only the precise band around 465 nm. The outcome is greater contrast, clearer object distinction, fewer stray reflections from ambient light, and enhanced image stability. This is particularly beneficial in machine-vision inspection tasks, where subtle variations in material, color, or surface texture must be consistently detected under changing lighting conditions.

BP465 Bandpass Filter Typical Applications:

• Blue LED or laser lighting systems

• Machine vision and quality inspection

• Color sorting and material differentiation 

BP465 Filter Lens and Camera Compatibility

The BP465 filter offers flexible installation options and can be integrated into existing imaging setups without modifying your current camera or lens.

In typical machine vision systems, it can be screwed directly onto the front of most lenses, since these lenses usually provide a standard filter thread for attaching optical filters.

When you're using a C-mount lens on a GigE camera or USB3 camera, the BP465 filter can also be positioned inside the C-mount interface rather than mounted on the lens front. This approach is especially helpful in cases where the lens has no front filter thread.

In this configuration, the filter sits securely between the camera and the lens, remaining fixed in the optical path. This stable placement helps maintain optical alignment and delivers consistent image quality.

Key Benefits for BP465 Narrow Bandpass Filter:

• High transmission efficiency at the 465 nm center wavelength
• Excellent suppression of unwanted out-of-band light
• Enhanced image contrast and overall signal clarity
• Consistent optical performance under changing environmental or lighting conditions
• Reliable and repeatable results in precision imaging and measurement applications

Select Your BP465 Narrow Bandpass Filter

hoose the BP465 narrow bandpass filter with the thread size that matches your lens. For help selecting the correct size or wavelength, contact our technical team.