Yes, I did hesitate before posting. If it is still banned completely, please delete my post.
Can you just stop doing it please? Nothing has changed, we still donât want it.
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OK.
Do you have access to another Nikon camera that you can test one of those two lenses against? This would help you ascertain if the camera is at fault.
Regards, Freddie.
Unfortunately no. I would only be able to borrow one from a store if I found something similar to my d3500
You might just take the lens to your local shop if you can, tell them whatâs going on and theyâd probably let you shoot a few testers
Are you applying a âfixâ to lens distortion in post? On 2 of my lenses it leads to smearing of objects in the mostâŚâfixedâ areas (usually, but not always, at edges of the frame)
This is SOOC embedded JPEG, so no.
Yeah, seems like the best idea to have it discussed with professionals. Iâll shoot with live view for now, and update yâall once I get chance
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Just because its the sooc jpeg doesnt actually mean it is not the camera âfixingâ distortion. My a6500 has an inbuilt measures and fixes the jpg (but leaves the raw untouched). Might be worth a look. 
Same with my Panasonic DC-G9
I checked the RAWs in darktable and itâs the same.
If toggling lens distortion off/on makes no alteration to the image, then that is (perhaps) good. I just saw in your other thread that you fixed everything by focusing in live view? Or, at least, I think that is what you were talking aboutâŚit is dificult for me to seperate out the issues given the interwoven posts and ambiguity of informal english.
Regardless, here is to hoping you resolve whatever the issue is to a satisfying degree!
Yes, kind of. Live view AF focuses the lens correctly (across the frame improvement). The blur when using viewfinder AF is possibly due to lens being not calibrated (It always focuses closer than it should).
The right side of phot is still less sharp, but that might be a design problem of the Sigma 17-50 mm.
Thanks, I really hope so⌠(am worried a bit)
Late to the party. Sometimes the focus plane can be revealed by edge detection, for example the GIMPâs Laplace - then Levels - then Threshold:
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If you still want to invest time into this, consider taking images of a large area suitable for continuous edge detection, eg a football field. (For more explanation, see Roger Cicalaâs post on field curvature). Then detect edges, eg like @cedric suggested, and post here (but maybe keep some more context, not just the edges).
You can also focus on an object with known distance you will remember (eg a tree, or a lamppost), and then compare where the focal plane ended up.