Quote:
Originally Posted by TrevorW
Thanks Greg good advice, do you think the 183c would bebetter suited to my ED80 or 110ED with reducer/flattener, then  |
Definitely. I used an ASI183 with my AP Honders cope which s 305mm aperture and F3.8 giving a focal length of 1159mm. It worked better than I expected but some nights it was a waste as it showed up the poor seeing too easily.
On nights of good seeing it was quite good and very sharp. I also noticed it was harder to focus than the larger pixelled cameras but also it tended to give rounder stars because there were so many more pixels in each star compared to the larger pixelled cameras.
Your RC focal length is nearly 2X the Honders so double the trouble and double the sensitivity to the seeing.
My CDK17 at almost 3 metres focal length is very sensitive to seeing even with a large pixelled camera. It becomes almost impossible to focus as even keeping the focus steady it would go in and out of focus with successive downloads.
So ideally you choose a focal length to suit your camera and seeing conditions as well as the type of image you want to produce.
A short refractor is not going to get a hot image of most galaxies but is great for wider nebula and star cluster.
Greg.