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Difference between 200mm and 300mm
On my Sigma 70-300 the difference between the 200mm setting and the 300mm setting is negligible. The 300mm is very slightly closer but it's hard to tell the difference, at least to my eyes.
Is this a normal thing across all lenses? If so, I'm assuming the difference grows smaller still on even longer lenses, based on the fact that the difference between the 18mm end of my 18-55 and the 55mm end is quite noticable, and that's only 37mm difference, as opposed to the 100mm difference on the longer lens.
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