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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Abu Mahendra
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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, Jul 26, 2014

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

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>>That which is asserted without evidence can be dismissed without evidence<<

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