Stuart, my thinking is that with small pixel dimensions the well depth will be quite low and this will provide a tendency to be overwhelmed at even modest sub exposures. Similar to what I currently get with the QSI and the RC. If the pixel size is around 9 microns then this issue goes away. The well depth is generally around 100,000e as opposed to 25,000e.
It may well be that the Atik has large pixel sizes but those indicated seemed to suggest otherwise. I am happy to be corrected. That said, I get bloated stars with small pixels on the QSI with the RC. It can be controlled to some extent by removing stars and replace with shorter subs where the stars are not bloated. I think overall though the better way around the issue is larger pixels.
