Well since no replies..I'll have a quick answer...keeping in mid you have an AP130, so, are seasoned. Historically the Canon's have had less noise which made them better for astro-work. Of course cameras like the 300D/350D/20Da helped elevate this status.
Of course other mfgrs make good cameras..of this there can be no question. But it still appears to be the consensus that the canon's still have less dark noise. However, this would not be "the one thing" to make a judgement on what DSLR to buy.
Most DSLR users use the camera at prime focus but if you have a collection of lenses for another type of camera (and want to use them for Astro) then I can understand reluctance to change types, rightly so.
Don't worry about the battle between CCD & CMOS...they both perform well with good designs. Just make sure you get a 16 bit camera..not a 14bit. Gives bigger bit depth resolution!
There are a lot of programs written that support canon features, like:
EOS_Movrec (to record video out);
APT ; blah blah. And ...many DSLR users have their camera
front UV/IR filter changed to allow more "spectrum" thru...makes it more sensitive for Hydrogen gas. This was limited to mainly Canons but I think there are now filters for other types nowdays?
Of course we haven't mentioned probably the most important part...
pixel size. Most modern cameras have around 5.0 microns per pixel, mine is 5.2 micron. Better to maybe have a pixel size of a little larger..lets say 6.0 micron or more. Best to try to match your
pixel size to your scope so you get around 1.5 arc seconds per pixel resolution (or more).
IMHO the larger pixel size cameras give better images than my smaller pixel size camera. I think the mfgrs have been rushing to make larger pixel resolution sensors (for the consumer market) and have to thus make smaller pixel sizes to fit into the sensor size. This does not really fit the requirements we want in a DSLR, for Astro work.
Finally if you do consider a good DSLR for Astro work...maybe you should also consider something like a cooled astro colour camera like
QHY8. While DSLRs are good all rounders they cannot match the dedicated cooled astro cameras. Consider a good DSLR costs $1500+ and a QHY 8 ..similar...just a little more.
Anyway...FWIW.
