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Very fast or short f/ratio mirrors - better for astro-photography?
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09-02-2008, 11:48 PM
skwinty
(Steve)
E pur si muove
Join Date: Dec 2007
Location: Cape Town
Posts: 494
Hi all
herewith a synopsis of focal ratio, focal length and aperture
Regards
steve
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Focal Length.pdf
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skwinty
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