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F-ratio myth
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21-02-2018, 09:41 PM
Camelopardalis
(Dunk)
Drifting from the pole
Join Date: Feb 2013
Location: Brisbane
Posts: 5,429
The light beam might be parallel as it enters the scope but as soon as it hits a lens or a mirror it is bent into a cone of light.
The steepness of the cone of light is directly related to its focal ratio.
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