Astronomik UHC-E Clip-Filter EOS APS-C – Ideal for Small Scopes Svbony Which full-width half-maximum (FWHM) is

Which full-width half-maximum (FWHM) is best

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Astronomik UHC-E Clip-Filter EOS APS-C – Ideal for Small Scopes Svbony Which full-width half-maximum (FWHM) isAstronomik UHC E Clip Filter EOS APS C Perfect for Deep Sky & Comets The Astronomik UHC E Clip Filter is a cost effective option for deep sky and comet observations under light polluted skies, ideal for smaller telescopes. The UHC E filter boosts contrast for emission nebulae and comets while blocking streetlight pollution and airglow, making it highly effective for telescopes up to 5" (125mm) in aperture. Main Use This filter offers a full width at