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Playing devils advocate here... (not sure if I thoroughly understand that there is no correlation between the FR and FL)
So are you telling me that:
An 8" SCT @ F/10 = 2000mm FL
An 8" SCT @ F/6.3 = 1260mm FL
Focal length (in mm) by the aperture (in mm). For example, a telescope with a 2032mm focal length and an aperture of 8" (203.2mm) has a focal ratio of 10 (2032/203.2 = F/10).
As you can see the FR changes the FL. So a faster ratio provides a wider view. Have I missed something?
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