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Strange issue: Canon EF 70-200mm f/4 L IS USM acts as 85-250mm. How?

Started 8 months ago | Discussions thread
OP Nightly Forum Member • Posts: 68
Re: Strange issue: Canon EF 70-200mm f/4 L IS USM acts as 85-250mm. How?
1

Comparison update: Some photographers criticized that the measurement was done wrong - at close distance. Though I was aware of focus breathing of the lens from macro, but the amount in zoom was very little, so I had small doubt it to be the reason.

Here are the images from two lenses taken during sports event with 5D camera. The difference might be not as big as in EF-S 55-250mm case but is still quite visible at 70mm. And again 70-200 seems to be zoomed.

70-200m f/4 L IS USM @70mm

24-70mm f/2.8 L II USM @70mm

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