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I used to have a mirrorless Sony Alpha A6000 camera.

The problem I had with it was that, no matter how hard I tried to keep the center of my photos sharp, my photos always looked blurry in the peripherals.

To illustrate, here's an example -- zoom in & compare the left and right of the photo with the center:

enter image description here

I eventually sold the camera and got a Canon T5i, and I have not experienced this problem with it -- my photos turn out sharp everywhere with the T5i:

enter image description here

(Unfortunately, I didn't take photos of the same scenes with both, but trust me that I experienced this problem with practically every single one of my A6000 photos, and none of the T5i ones.)

Is this a known problem with the body or the stock lens? Or is it a problem with entry-level mirrorless cameras in general? Why does it seem hard to find any kind of information about this problem online?
The whole thing has been extremely surprising to me, because whenever I have searched online, the Sony A6000 has seemed to be universally regarded as a better camera than the Canon T5i, and I would never have expected its photos to turn out so comparatively awful. What's going on?

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    Why would you assume this is related to the camera and not the lens? – osullic Jul 21 '16 at 9:47
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    @osullic: I guess for the same reason that the recommendations I find online don't say anything about the lens? Because I don't know better... – Mehrdad Jul 21 '16 at 10:18
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    You should probably read this question for the value of Snapsort for.... well, anything. – Philip Kendall Jul 21 '16 at 10:20
  • @PhilipKendall: Thanks, good to know, but it's not like SnapSort is the only source saying A6000 is better without any mentions of any lens. Like I said, it seems a pretty universal recommendation -- do you disagree with it yourself? – Mehrdad Jul 21 '16 at 10:22
  • Images are formed by the lens. The body, essentially, is just a light-tight box, with a light-sensitive sensor sitting inside. Optical aberration is a "feature" of an optical lens. That's it in a nutshell. – osullic Jul 21 '16 at 14:13
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It is known problem with this objective.

Check out this review for measurements and samples for the stock objective.

Here is a more expensive one which does not exhibit this defect (made for Minolta A mount but adapted to NEX for testing): http://www.photozone.de/sony_nex/730-sony1650f28?start=2 . It seems that some design properties are causing this defect which are more often to happen with MILC.

I could also find an SLR objective that has this defect but I need to spend some time digging.

  • Hm, but I don't see the problem in the samples, and I'm not sure which measurements you're referring to either. For example, if you look at this sample photo, sharpness seems pretty uniform across the image... nothing like the one I showed. – Mehrdad Jul 21 '16 at 9:14
  • +1 Oh, actually, I think I see what you're saying now! The MTF plots are a little hard to read for me, but when I look at the "Field map" under "Sharpness" in DXOMark, the difference is quote obvious: A6000 lens vs. T5i lens... however I'd love a more detailed answer if possible. Thanks so much for pointing me in this direction though! – Mehrdad Jul 21 '16 at 9:49
  • @mehrdad: that one is done at F8 and does not obviously expose this problem (traces still visible in top left corner). Look at samples done at F3,5 or so. – Euri Pinhollow Jul 21 '16 at 10:05
  • Interesting... when I look at e.g. this one, it's awful vertically but rather uniform horizontally... which is sort of the opposite of what I see in my case. But otherwise it's the same effect, yeah. – Mehrdad Jul 21 '16 at 10:20
  • Regarding your edit, I see this field map which still seems to have this effect? (Compare with the A6000 lens and the T5i lens.) – Mehrdad Jul 21 '16 at 20:06

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