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MidOpt LP Series Filter LP345

Uniforce Product

Salient Features

LP345 Precision Multi-Layer VIS A/R Coated Glass 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%
  • StablEDGE® design reduces angular dependency and minimizes short-shifting effects
  • 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.


LP345 Windows are made from made from precision polished BK7 optical crown glass, resulting in no image distortion and excellent transmission in the visible and near-infrared spectrums. They are environmentally stable, stain-resistant and virtually free of bubbles and inclusions. MidOpt LP345 Windows are precision double-side, “flip” precision ground and polished and are coated on both sides. These durable broadband, multilayer anti-reflection coatings limit glare and other reflection losses while helping to achieve optimal image quality.

MidOpt LP345 Tran Graphic





  • StablEDGE® design reduces angular dependency and minimizes short-shifting effects
  • Useful Range : 350-800nm
  • Cut-on Wavelength 50% T : 340nm
  • Tolerance : +/- 10nm
  • Peak Transmission : ≥98%
  • 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.


LP345 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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