I've started a new thread to discuss this issue because it is not just a Canon problem.
This has been mentioned in relation to the Canon 750D and Canon 760D in this Cloudy Nights thread:
Another thread on the Canon 750D banding issue caused by the Auto Focus pixels:
Apparently Canon's response is to not heavily post process. Most deep sky images require what would be described as heavy post-processing (e.g. light pollution subtraction). If it is true that calibration frames (i.e. flats and bias) do not fix this issue then one has to question the suitability of the 750D (and 760D) for deep sky astro-imaging.
The Sony A7r2 has similar banding caused by the Auto Focus pixels that can even be seen without post-processing:
The Sony A6000 has the same issue without post-processing:
I hope these sensor issues are not the start of a new trend. The cameras I mention above are just ones I happened to find doing internet searches. How many other cameras are similarly affected?
If you have examples from other cameras then please post them. Is it really the case that calibration frames cannot deal with this issue?
Edited by sharkmelley, 19 March 2016 - 08:38 PM.