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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
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Re: On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?
In reply to Howard, Jul 26, 2014

Thanks Howard.. I think Focus Breathing is the lingo. I've never heard of this.

http://www.bobatkins.com/photography/technical/focus_breathing_focal_length_changes.html

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