On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?

Started Jul 26, 2014 | Questions thread
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Sir Atfus OP Forum Member • Posts: 77
Re: On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?

I loaded some pictures in this thread.

http://www.dpreview.com/forums/post/54091986

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