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

Started 5 months ago | Questions thread
Abu Mahendra
Senior MemberPosts: 2,398Gear list
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Re: On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?
In reply to Sir Atfus, 5 months ago

It could even be simpler than focus breathing. It could well be a case of false or "optimist" labeling.

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