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

Started 5 months ago | Questions thread
Sir Atfus
Forum MemberPosts: 77
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Re: On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?
In reply to Howard, 5 months ago

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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