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Different Focal Lengths, Same Angle of View


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#1 Nick Norton

Nick Norton
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Posted 05 April 2010 - 04:45 PM

I am shopping for a fisheye to fit my 7D, and am confused on the claims of some lenses.

Comparing a 7mm with an 8mm fisheye, they both claim to have a 180 degree diagonal angle of view.

How can this be if the focal lengths are different?

How can i determine which fisheye is widest?
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