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How to test actual focal length?

From Matt Grum's comment to my previous question, I learned that manufacturers may casually "round" actual focal length of a lens to some nice number that gets printed on the box and stored into EXIF. ...

focal-length tests

asked Jun 29 '11 at 20:36

Imre
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Apples by Garik submit your photo Picture of the Week Themes Suggest and vote on themes Please participate in Meta and help us grow.

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How to test actual focal length?

Apples
by Garik

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