Originally posted by Docrwm The more I look at the pictures, and I may be way off here, the more the banding looks like an artifact of the ribbing inside the adapter.
Hmmm that sounds like a possibility.
I'm also beginning to think that full frame lenses may be more prone to reflections in these adapters because they project a wider image light circle.
(I think Barondla had surmised that could be the prob.)
Perhaps also some combination of the large image circle and a glass element near the rear that bounces the reflected light back on the sensor?
Perhaps Doc you can try some of your DA lenses on this adapter and see if the banding goes away?