Thread: Mars 20th nov. 12.5"+good Ol' toUcam
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Old 21-11-2005, 04:05 PM
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Striker (Tony)
Whats visual Astronomy

Striker is offline 		 
Join Date: Dec 2004
Location: Brisbane
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Yep what Mike said....F ratio is only the ratio of aperture to Focal length....

It's the focal length that gives you the scale.

See I said Houghy post would confuse people...lol
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