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EFS 17-55 USM corner blurriness: experts' opinion needed !

Started Nov 2, 2014 | Questions thread
MAC Forum Pro • Posts: 18,502
Re: EFS 17-55 USM corner blurriness: experts' opinion needed !

70d IF wrote:

MAC wrote:

70d IF wrote:

MAC wrote:

Do brick wall test on tripod with IS off. Shoot, then flip 180 and shoot again. Compare corners. Right angle orientation to the wall critical.

I have no brick wall at hand right now, but I already did this test, with the same kind of result as the hedge shown here.

your dof is as thin as it gets with that lens f2.8 and 55, I can't tell if you are perpendicular or not

those settings might be good for a portrait where the corner makes no diff

I'd like to see the brick shots and 180 flip which will tell us the data we need

I promise that I was perpendicular ! The dof was not so thin, because the hedge was at a distance of approximately 25 feet.

Anyway, I will try to do your test, but please be patient, I won't be able to do it until next week-end.

not a problem to wait - it's the 180 flip that confirms the data.

clean the lens real good - both ends - before testing

in future, always do the brick testing under the return period.

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Canon EOS 7D Mark II Canon EOS RP Canon EOS M6 II Canon EOS R8 Canon EF 70-200mm f/2.8L USM +7 more
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