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Old 27-02-2008, 09:28 AM
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Geoff45 (Geoff)
PI rules

Geoff45 is offline
Join Date: Jul 2006
Location: Sydney
Posts: 2,519
If you are imaging stars, focal ratio theoretically makes no difference and in practice makes hardly any difference, so for things like the jewel box, use any method you find good to increase the focal length. It is only for imaging extended objects--nebulae, galaxies, planets etc that you need to worry about focal ratio.
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