Weird color circle banding issue NX200

Started May 22, 2012 | Discussions thread
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Weird color circle banding issue NX200
May 22, 2012

When I use the 20-50mm kit lens with my new NX200 in low light and bring up exposure in Lightroom, it reveals some rather disturbing color rings. The first pic here (trying to get a picture of a red crab in a terrarium) was taken with my MF 57mm 1.4 Konica Hexanon adapted lens, while the second is AF 20-50mm. All settings were otherwise the same (M mode, RAW+SF, NR off, ISO-200).

I noticed these rings/circles on some shots I took the other night in very low light, they occur at low and high ISO, doesn't seem to matter and become quite apparent as soon as I up exposure in LR4.

MF Konica 57mm Lens:

AF Samsung 20-50mm Lens:

 sensibill's gear list:sensibill's gear list
Sony SLT-A57
Samsung NX200
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