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20mm f2.8 Back/Front focus issues

Started Jan 30, 2020 | Questions thread
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Puljak Regular Member • Posts: 101
20mm f2.8 Back/Front focus issues

I'm wondering if anyone had such problems with their Samsung NX lenses, and if yes, how were the problems resolved eventually?

AFAIK, CDAF systems do not suffer from problems with front/back focused photos, so it must be some kind of a problem with the lens. I was wondering what could go wrong in the lens to cause front/back focus issues? Mine definitely suffers from back focus I think. I had it checked recently because manual focus wasn't working at all, and, strangely, AF did work but it missed its targets. Now, manual focus works, but the lens still does not hit its targets. The problem is most pronounced when focusing at infinity. Here are two images to illustrate. The first one was AF, and the second one was manually adjusted.

Both were shot at f/5.6

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