Eyepiece Filter 1.25 In 31.7mm Light Pollution Reduction Compatible For W/Observat

filters or light pollution reduction filters are designed to selectively reduce the transmission of certain wavelengths of light;especially those produced by artificial light. Due to its ability to produce exceptionally for and clear images;this filter is considered of the most popular astronomy accessories;it can be used not only for observations but also for astrophotography. Optical glass lens;aluminum frame;significantly reduces light pollution;great for city and suburban observation. 1.25'' diameter simply attach to eyepiece in a sturdy for case;standard filter thread for 1.25" eyepieces and other accessories. for background is darker;and contrast of emission are noticeably improved;the perfect filter for viewing from light polluted skies;or for boosting the contrast of from dark for