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 p.47 #19 · Sony FE 24-70mm f/2.8 GM Rolling Review | |
Chris_88 wrote:
Thanks for sharing your experiences. If the drop off in resolution was uniform, it would be a different story, but it's not. With the first lens, the outer regions of the frame were just extremely crappy. The second copy was better, but the lower left corner region never got sharp. Decentering may be to blame for that, I don't know.
My level of reference is/was this thread, so I don't think my expectations for 70mm had been through the roof. If things can't be sorted out, then I'll have to re-consider the TAP and 35 1.4 or re-acquiring a Sony 35 1.4 (which I know, would most likely mean more lottery playing)....Show more →
This probably my first post in FM. I am sorry to hear that your copies of 24-70gm were not performing well.
I move from Canon, and I realized that Sony QC is on par with canon, which also have a lot of decentering issue, but the DSLR microadjustment help to alleviate some problem -- you can give up some center sharpness for better corners etc.
Here is a little experience with my copy.
My copy is perfectly centered from 24-60, peak resolution at 28-50. sharpness notably drops from 60-70 when shooting landscape but still extremely sharp for portrait distance. And I found a interesting phenomenon, at 70 end, F2.8 show no decentering issue. All 4 corners are decently sharp. but at F4 and 5.6 (worst), the astigmatism in low left (good Tan, but blurry Sag) increased in the corners although the center improves a lot. At F8, that corner get much better, and all corner are even. At F11, all corner get further improved to a pixel peeping level. I dont' find diffraction at F11 bother me since all details are there just a little loss in contrast, which is easy to fix in the post processing.
Apart from that slightly decentered corner, all other corner also show a outward filed curvature. So to get best corners and largest DOF, I focus a little in front of the main target. It works well.
I chose not to return it because the very strong 24-60, I don't know whether my next copy will be this good. It beats my previous canon 24-70 II (I think that was a pretty copy as well) quite a bit. I found that 70mm for landscape really need to stop down. if you want to cover some foreground, even you have a stellar copy, F11 even 16 is needed, or you need to do focus stacking. Otherwise, shooting long distance stuff like from the top of mountains, a little decentering won't matter. at least in my case, even at F2.8-5.6 on 70mm, all corners are good. If the lens is noticeably decentered at wide end, that is another issue, and need to be returned.
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