Sony A7III Posterization and Colored Banding

[Larry0622]

I took some milky way with Sony A7RIV and Sony 16-35mm f2.8 GM. The photo shows circular color banding artifact when post-processed as shown in the following photo, taken with ISO 100, 16mm, 6" at f2.8.

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Some tests are done to try to identify the source of the artifacts. All photos in the tests were taken with the lens cap on.

All photos in the above results are applied the same following adjustments.

It appears that the circular color banding happens with ultra wide angle (16-19mm).

Is this an issue of my unit or design? Is this an issue of camera or lens?

 

 

 

 

[dbmiller]

Looks like it is the in camera lens corrections for vignetting. Try turning that off and see if it still happens.

[Larry0622]

4 hours ago, dbmiller said:

Looks like it is the in camera lens corrections for vignetting. Try turning that off and see if it still happens.

A quick test confirms it. The same enhancement in Lightroom as in the original post is applied to the photos.

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Thank you very much for your hint, dbmiller.

I didn't think Sony would allow the in camera processing affect RAW, but Sony does.

[mcslsk]

Just ran into this post. I have been experiencing this issue with many a7xx camera, including a7r2 and a7III. Disabling in-camera corrections did not help. This seems to be the case on the a7r4, though. Great. Question: Some lenses don't allow turning Distortion Comp. to "off". Are those Color Polygons still gone even if that correction is (forced) on in camera? Here is a link to the discussion on this on dpreview a while back: https://www.dpreview.com/forums/thread/4359229

[lubomir]

this could be also connected with compressed raw format in camera setting and underexposed scene. so just try saving as uncompressed raw. here it is at 6:00min: