The PS40 scope has all the features of the PS22 but has a 40mm eyepiece/output window, utilizes 3rd, 4th, and WPT generation Image Intensifier Tubes, and is slightly heavier. The newest technology has been added to the PS40 scopes in the form of White Phosphor Technology (WPT). This new technology displays the sight picture in black & white instead of green and the resulting resolution enhancement is noticeable. The sight picture is brighter and sharper with better contrast and depth perception than higher generations of green phosphor sights.
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