They show great structural details, but have natural colors, looking like an RGB image. Greetings And thank you for visiting Agena AstroProducts. Many images of planetary nebulae and supernova remnants are taken only with H-alpha and OIII filters. Affordable, Quality Telescopes, Binoculars and Accessories for the Astronomy Enthusiast. This is a blue-green colored filter as OIII emits 495.9nm and 500.7nm. Filter mount thickness: above threads: 5mm including threads: 6.78mm. Founded in 1999, Optolong has become an integrated enterprise not only specialized in R&D, but also good at manufacturing. Radian Raptor 61 Canon EOS Ra Optolong L-eNhanced Filter Sky Watcher EQ6-R Pro. is the brand owner of optolong who is the joint of industry and trade. Allowing 25nm bandwidth of light centered on a wavelength of 500nm to pass through, which corresponds to OIII emission lines. See a recent post on Tumblr from jzholloway-sncastro about agenaastro.Selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting (including mercury vapor lamps, both high & low pressure sodium vapor lights, and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.The Optolong O-III (Oxygen-III) filter is designed to improve the visibility of various deep sky objects. Color Correction & Minus Violet Filters.Correctors, Focal Reducers & Flatteners The Optolong L-Pro helps to fight light pollution against broadband targets such as these blue reflection nebula and galaxies, while the Optolong L-Extreme isolates hydrogen and oxygen nebula emission lines to capture supernova remnants and more.
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