this topic seems to be of interest to a few folks, so thought it was time i posted results of my test a couple of months ago:
http://philhart.com/content/qhy9-vs-astro40d
ever since i took
this image of the horsehead, i have been convinced that the QHY9 is a very capable camera. so I am surprised at how close the Astro 40D gets in this test, but I can only let the results speak for themselves.
Phil