Thread: Fast Scopes?
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Old 09-11-2012, 08:24 AM
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fauxpas (Tony)
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Fast Scopes?
Why are lower F ratio scopes often referred to as fast?

If F5 is fast and F8 slow, if the focal length for both scopes is 1000mm but the F5 lets in more light, what does speed have to do with it?

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