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

Started 2 months ago | Questions thread
drbird
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Re: On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?
In reply to R2D2, 2 months ago

Sadly it is the even the new big white ones are not free from it... but it kicks in really late, jus about when one focus closer than the pre-version allowed. The L 70-300 is one which suffers quite a bit from it as well as the 100-400 see

All the super zooms suffer from it, and often very substantial, just look at the magnification at the maximum focal length for instance for the 70-300L it is 0.21 at 1.2m which exactly the same for the 70-200L = means the 300mm are gone at 1.2m and the lens has the same focal length as the 70-200L at this focusing distance.

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