Optolong L-eXtreme Dual-band Filter - 2-inch | OPT Telescopes
Optolong L-eXtreme Dual-band Filter - 2-inch | OPT Telescopes
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Optolong 5 band-pass L-Pro filter Thanks to Garnett Leary, a fair and objective review of L-Pro filter. Designed by highly experienced Optolong professionals who engaged in optics more than 30 years and manufactured by finest OTFC-1300 coating machine , the Optolong L-Pro filter is unlike any other light pollution filter on the market. It allows only main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm),H-alpha(656nm) as well as SII(672nm) to pass allowing any
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Optolong L-Pro Broadband Light Pollution Filter - 2"
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