Hi Chris,
Much appreciated for your reply. Lots of information to digest and review and appreciate your time to provide such a detailed post.
I am planning to use the camera with a alt az goto tracking system with a laptop to live stack the images. I currently dont have a goto eq mount as yet.
I think you have convince me to get the zwo 224mc to start off with.
I have seen the cloudy night's eaa forum, something similiar would be awesome.

Yep i defintely need to get a focal reducer for the sct and the stellavue refractor.
I was going to ask if there is there an easy way to calculate backfocus with the camera and thr telescope you are using?
My thanks again for your advice.
M11