Edge Pass Optical Filters

There are a lot of types of Optical filters that provide a solution for the full spectrum in managing light and exposure and they all serve the same basic purpose, and that is to transmit light of a certain wavelength or color hue while preventing other colors from getting through.

Under the Optical filters are edge pass filters, edge filters divide incident light into two parts wherein one part has the light with longer wavelength while another part contains the light of a shorter wavelength. 

These two parts are called the Long Wave Pass (LWP) and the Short Wave Pass (SWP). This article will expound more on the two filters and an extra pass filter called the bandpass filter.

Long Wave Pass Filter

The goal of a long wave pass filter transmits longer wavelengths of the color spectrum like infrared, ultraviolet, and visible light. LWP filter sometimes appears as colored glass which blocks shorter wavelengths and reflects selected wavelengths instead of absorbing it. 

In LWP, it reacts on the specified cut off for wavelength and conduct minimal transmission below or maximize above the emission of wavelength. 

It is also evident that a long pass rejects short wavelengths in some regions and these filters are designed by a high rejection and high transmission region that is provided by thin-film coatings or absorptive colored glass that can be useful in a variety of control.

Short Wave Pass Filter

Short wave pass filters are designed differently than long wave pass filters, this filter reflects shorter wavelength and transmits longer wavelength. It also serves a different goal than the LWP Filter, and it can be seen as a colored glass filter that is the same with LWP Filters but rather result in a different and opposite effect.

Short Wave Pass Filters can be used together with the long-pass filter to create a bandpass filter for the purpose of selective transmission for the color spectrum while rejecting all the wavelengths not necessary during the process.

SWP Filters perform better in blocking maximized transmission than long pass wave filter as it also offers low polarization dependence, broad spectral range, and can easily minimize unwanted heat caused by infrared.

Bandpass Filter

When both the long-wave pass filter and short wave pass filter move-in coordination and eventually combine each wavelength, it will result in a bandpass filter. This filter has the quality of both long pass filter and short-pass filter which can manipulate the number of layers in the filter to allow the transmission of a wide or narrow light.

A bandpass filter isolates a band of wavelength and provides a high band for both transmission and rejection spectrum of colors and energy. This filter is also designed to be deployed in a variety of applications including blood chemistry analysis, traffic control, and paint color formulation.

Bottom Line

Cut on and cut off edges are typically designed by longwave or shortwave pass filter coatings which provide the transition between a high rejection and a high transmission region. To learn more about the optical filter, the best type of camera filters, and more likes of it, visit and see more of what new learnings we can share to you.

About the author


Patrick Ballino created Festival of News Magazine and he loves writing about Arts and Entertainment. He and his team love creating content for their audience.