Svbony 1.25" Telescope Filter with High Contrast Optical Lens UHC Aluminum Frame Eyepiece

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