OK, the 10100 variant of the Nightscape seems to work properly; frame and focus gives a "black" frame, and the histogram for a dark shows most of the pixels at the far left of the graph ... so, I can continue to fiddle with SGP with both the D90 and the 10100 ... I don't know what the problem was with the 8300, maybe a bad unit or a bad model. I'll see if I can return it to Celestron and let them fiddle with it ...
↧