The Longpass Lens Filter 490 nm is a lens filter engineered to transmit wavelengths above 490 nm, offering a functional spectral range from roughly 476 to 1000 nm, while blocking shorter wavelengths. It attaches directly to a machine vision lens using the standard filter thread. By blocking unwanted light below the cutoff point, the filter improves contrast and makes features easier to see, even in challenging lighting. A wide selection of thread sizes is available to ensure compatibility with both compact and larger-format lenses. LP490 Longpass Filters Specifications A longpass filter blocks light below a defined cutoff wavelength and allows light above that point to pass. For the LP490 filter, wavelengths above 490 nm pass with high transmission, while light below 476 nm is strongly blocked. This broad transmission band—covering visible light and extending into the near-infrared—makes the LP490 suitable for imaging setups that use white-light illumination, multi-spectral lighting, or scenes with significant short-wavelength interference. Specification Filter type Longpass Useful wavelength range 476-1000 nm Where to Use a 490 nm Longpass Filter The LP490 filter transmits light above its 490 nm cutoff wavelength, helping stabilize image brightness and reduce contamination from UV and blue light By removing ultraviolet and shorter visible wavelengths, it enhances image contrast and signal stability when used with light sources such as white LEDs, blue suppression lighting or broad-spectrum lamps. The filter is well suited for machine vision, industrial inspection, laboratory setups, and other imaging systems that require controlled spectral separation. Common uses: · UV and blue light suppression · Imaging under white or visible-light illumination · Print, surface, and material inspection Advantages of LP490: · Passes wavelengths above 490 nm with high efficiency · Strong blocking below the cutoff wavelength · Better contrast and detail in camera images · Stable performance in both uniform and variable lighting · Supports accurate and repeatable imaging tasks Longpass Lens Filter 490 nm Lens & Camera Compatibility Most machine vision lenses include a front filter thread, allowing the LP470 to be mounted directly in front of the optics. For systems using a C-mount lens on a USB3 camera or GigE camera, the filter can also be fitted within the C-mount interface. This option is especially helpful when the lens has no front filter thread. Placing the filter between the lens and camera keeps it securely aligned with the optical path and maintains consistent imaging performance without requiring hardware modifications. The LP490 filter offers versatility for various optical setups and can be integrated easily without modifying the existing camera or lens assembly Available Thread Sizes and Mechanical Options To support a wide range of lens models, the LP490 is offered in numerous industry-standard thread sizes: - 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 If you plan to use a C-mount (CMT) filter thread, complete the form below to receive instant access to the installation guide and lens compatibility information. hbspt.forms.create({ portalId: "7372172", formId: "9b7a9007-56f1-47fe-8842-3e0b38317a2e", region: "eu1" }); Industry Applications for LP490 Filters · UV and blue-wavelength suppression· General machine vision imaging· Surface, texture, and material analysis· Print quality verification· Laboratory imaging setups· Industrial inspection requiring spectral control Order LP490 Longpass Filters Select the Longpass Lens Filter 490 nm in the thread size you need. Contact us if you need help choosing the correct cutoff wavelength or size.
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