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• 23:22, 16 December 2024 What's Up? talk contribs uploaded File:Observation 007 Dec 14 24.jpg (A triplet apochromatic lens with a 50 mm aperture, 250 mm focal length, and f/5 focal ratio. It also includes one piece of ED glass to control chromatic aberration. The S50's imaging performance is comparable to that of a professional refractor with the same aperture)