Hi Everyone, I recently purchased an FE 200-600mm G OSS lens for wildlife and astrophotography with my Sony a6000 camera. While this lens provides excellent zoom capabilities, I am seeing weird white/blue circles around all my Astro pictures (see below). I am not sure if this is an issue with the lens or the APS-C camera (or the combination of the two). I will much appreciate if someone can provide any pointers to help me fix this problem. Thanks in advance.

Edited November 2, 20205 yr by taonight
Too much information

Did you push the exposure a lot in post? This may cause such effects. Also try disabling automatic shading compensation.

Hi Pieter, thanks for responding to this post. I was doing a regular curve stretch in post. I read on DPReview (https://www.dpreview.com/forums/post/62199570) that Sony applies some sort of correction profile to RAW images which causes similar patterns to pop up in post. I am not sure if that is what is causing my images to have these circles. I have turned off all the "Lens Comp" options (Shading comp, Chro. Aber. Comp. and Distortion Comp.) on my A6000. 

Someone had a similar issue with 200-600 when they had a UV filter on the lens.
Sony recommended not to use such a filter when he contacted them.

I use a plain glass filter (to protect the lens). 

Thanks, LiveShots for responding. Initially, I was using a UV filter and it was giving me exact same ring in all my images. After that, I removed all the filters. This image was shot without any filter on. 

Hi taonight,

this is frustrating! Sony SEL200600G with A6000 is not a general problem. I use this setup as well and don't see any abnormal patterns (even if I push the exposure to the maximum and see almost only noise). I also use the full-frame Sony A7R with the SEL200600G lens and I don't see any patterns.

The picture shows one of my first asotrophotos with this setup - also the Andromeda-Galaxie M42, 28x40s F5.6 ISO-800 600mm.

I would recommend trying a different stacking software or maybe a different RAW converter. Do you have the possibility to test the lens with another Sony E-mount camera?