Thread: Sigma 500mm f/4.5 APO EX DG
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Old 30-10-06, 14:21
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yelvertoft yelvertoft is offline  
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Quote:
Originally Posted by Stephen Fox View Post
the Nikkor provides 2 1/3 extra stops over the Sigma.
Errrm, isn't f2.8 to f4.5 just one and a third stop?

See:
http://en.wikipedia.org/wiki/F-numbe...F-number_scale
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