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You're operating at the same magnification in both cases and you'll have the same FOV if both cameras have the same pixel geometry (same number of rows and columns).
Both configurations will have the same effective speed. You're spreading the same number of photons over the same number of pixels in both cases - the aperture and FOV are the same.
Comparing f/ratio between scopes only makes sense if you're talking about the same sensor in both cases.
Cheers,
Rick.
Last edited by RickS; 23-04-2012 at 09:06 AM.
Reason: Second post beat my reply by seconds. Removed comment that didn't make sense with an intervening post....
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