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MidOpt LP Series Filter LP418

Uniforce Product

Salient Features

LP418 UV Block A/R Protective Window

Often referred to as a “sharp-cut” filter, Longpass Filters are specifically designed to pass a broad spectrum of longer wavelength light while blocking shorter wavelengths.

  • Economical solution for isolating specific spectral regions
  • Peak transmission ≥90%
  • Anti-reflection coated for maximum transmission in VIS and NIR spectrums
  • Can be used with Shortpass Filters for a custom, fine-tuned Bandpass Filter
  • Double-side polished glass for exceptional parallelism and optical flatness
  • Exceptional surface quality; 40/20 scratch/dig
  • Available in wavelength ranges from 350nm to 1500nm

Longpass Filters are often used in fluorescence applications to block an excitation light source or to pass multiple emission wavelengths, improving signal to noise ratio. Longpass Filters are also commonly used in photography and astronomy.


LP418 filters are absorptive filters used to block unwanted ultraviolet (UV) light while allowing high (>90%) visible and near-IR light transmission. Camera sensors typically will have some sensitivity in the UV spectrum. This light can at times be recorded by the camera as if it is blue light, resulting in an exaggerated bluish tint. These filters are well suited for color imaging applications as they absorb UV light, are angle insensitive, and are precision ground and polished to exceptional flatness and parallelism. They are also frequently used in UV fluorescence applications to block interference from a UV excitation source, thereby increasing image contrast in the visible range. This material is unique in that it contains almost no phosphorus, and therefore does not autofluoresce when exposed to intense UV light.


MidOpt LP418 trans graphic



  • StablEDGE® design reduces angular dependency and minimizes short-shifting effects
  • Useful Range : 425-1100nm
  • Cut-on Wavelength 50% T : 418nm
  • Tolerance : +/- 10nm
  • Peak Transmission : ≥90%
  • Surface Quality : 40/20




MidOpt StablEDGE™ optical filters are specifically designed to be less  susceptible to effects from angular shifting seen when optical filters are placed in front of short focal length (<12 mm) camera lenses.
StablEDGE™ filters take advantage of absorptive filter glass to form the leading
edge of the filter passband.This assures no shifting in this region, even when the
lens FOV exceeds 100°.StablEDGE™ designs are  less angle-of-incidence sensitive, inherently more rugged, and are environmentally stable.


LP418 Transmission Chart PDF

Learn More About

›  Color Separation for Monochrome Imaging

›  Blocking Unwanted Light in Monochrome Imaging

›  How Bandpass Filters Increase Resolution in Monochrome Imaging

›  Near-IR Imaging in Monochrome Applications

›  Fluorescense Imaging in Monochrome Applications

> Learn More About How to Minimize the Effects of Short Shifting


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