Thread: Very fast or short f/ratio mirrors - better for astro-photography?
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Old 09-02-2008, 11:48 PM
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skwinty (Steve)
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skwinty is offline 		 
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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File Type: pdf Focal Length.pdf (27.8 KB, 34 views)
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