GSO 2" Photo-Visual Coma Corrector for Newtonian Telescopes
衞星叔宿專業天文莊園- 13seconds, single shot, ISO8000, A7S, 20" F3.7 DIY horse shoe mount blind tracking, with GSO Coma corrector, L-pro light pollution filter, just strenghtened contras in snapseed.
Tubo Extensor de 80mm de 2" GSO con rosca para filtros
Revelation 0.75x Focal Reducer for GSO Ritchey Chretien OTA | comprar barato aquí
GSO photovisual coma corrector - astrojolo
M42 GSO Coma Corrector Test ( mikebrous ) - AstroBin