Bandpass Lens Filter 640 nm, Select your size, 640 nm peak wavelength

 The Bandpass Lens filter 640 nm is engineered to transmit light at its 640 nm peak wavelength, blocking unwanted wavelengths outside its designated passband. This selective filtering enhances contrast, color separation, and measurement stability in machine vision and optical applications.

The filter mounts directly onto machine vision lenses using the standard front filter thread, ensuring secure installation and stable optical performance.

Multiple thread size options make the BP640 compatible with a wide range of lenses used in industrial and scientific imaging systems.

Narrow Bandpass Filter 640 nm overview

Narrow bandpass filters transmit a specific section of the spectrum while suppressing all out-of-band light.

Specification
Filter type	Narrow Bandpass
Peak wavelength	640 nm
Peak wavelength color	Red
Useful wavelength range

Thread Size Options for Bandpass Lens filter 640 nm

The BP640 filter is available in several common machine vision thread formats, allowing a secure and precise fit for a wide variety of 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

Want to use the Bandpass Lens Filter 640 nm with a C-mount (CMT) Filter?

The BP640 can also be installed inside the C-mount interface—ideal for lenses without a front filter thread or for compact setups where front-mounting is not practical.

If you plan to install the filter inside the C-mount interface, simply fill out the form below to get instant access to the mounting guide and lens compatibility information.

Applications for a 640 nm Bandpass Lens Filter

The BP640 is designed to isolate the red spectral band, improving clarity, contrast, and detection accuracy in imaging systems that rely on red illumination or red-sensitive inspection techniques.

Red-band isolation: enhances defect visibility and marking contrast on monochrome cameras.
Material differentiation: improves detection of red-responsive features.
Higher contrast with white light: strengthens detail separation at 640 nm.
Ambient-light resistance: minimizes interference from surrounding illumination.
Stable performance: maintains consistent imaging quality under changing conditions.

Best for: machine vision inspection, color sorting, fluorescence imaging, and red-band measurement tasks.

Integrating the BP640 into Machine Vision Systems

Most lenses include a front filter thread for direct installation. 

For C-mount lens on GigE camera or USB3 camera, the filter can also be positioned inside the C-mount connection—a useful option when the lens lacks a front thread. Mounted between the camera and lens, the BP630 maintains stable positioning within the optical path, ensuring consistent alignment and reliable imaging performance.

These flexible mounting options allow the Bandpass Lens filter 640 nm to integrate easily into both new and existing machine vision configurations.

Key Advantages of the BP640 Narrow Bandpass Filter  

The BP640 delivers high transmission at the 640 nm center wavelength and strong rejection of out-of-band light, resulting in cleaner, higher-contrast images. Its stable optical behavior under changing illumination ensures consistent and repeatable performance, making it well suited for precision inspection and demanding machine vision applications.

Typical Uses for a 640 nm Bandpass Lens Filter  

The BP640 is well suited for imaging tasks that rely on red illumination or require selective enhancement of features that respond strongly in the 640 nm spectral region. Its ability to isolate this narrow band makes it valuable across a wide range of industrial and scientific applications.

• Red LED or laser illumination

• Surface and defect inspection

• Fluorescence and color-based imaging

• Material identification and sorting

• Red-wavelength contrast enhancement

Select the BP640 Filter for your application

Select the Bandpass Lens filter 640 nm in the thread size that fits your lens. For assistance choosing the right size or wavelength, contact our technical team.