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Possible Canon 55-250 IS STM Decentering Issue

Started May 25, 2016 | Discussions thread
photonius Veteran Member • Posts: 6,895
Re: Possible Canon 55-250 IS STM Decentering Issue

skogsfaktor wrote:

Thanks for the tip!

I ran it through 50% DLO in DPP 4, making the flaws much more apparent.

Here are crops of the best(top left) and worst corner(bottom right). In my opinion the upper left corner looks more distorted. Is this normal? Could it just be an effect of my handheld shot, since the camera probably wasn't parallel with the wall?

Top Left Corner Crop

Bottom Right Corner Crop

hmm, to me, the bottom right looks better.   That's the point, if we can't agree on this, it can't be a serious issue.  And anyway, if you want to look for small differences, yes, you need to take it to another level, and do very careful tests with test charts, with well calibrated and aligned equipment.

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