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Telescope Focal Ratio Explained: What f/5, f/8, and f/10 Actually Mean for What You See
Somewhere on every telescope’s spec sheet, tucked between the aperture and the focal length, sits a number that looks like an afterthought: f/5, f/8, f/10. Most beginners skip right past it and go straight to comparing aperture sizes, because a bigger number obviously means a better telescope, right? Except that little f-number is quietly deciding…