Just a quick note on T adapters. You can forget that old threaded system of attaching a DSLR to a scope.
Look for something called a MAX dslr. They make them for Pentax Canon and Nikon as far as i remember. Its a 2" tube one end and a bayonet DSLR mount
( just like a lens ) on the other end. You can use an adapter to reduce from 2 " to 1¼ " , which are the two common sizes.
I've used a 600mm refractor scope for bird photography, and will be in the process of getting another at some point. Its a cheap way to get massive reach without spending zillions £££$$$$$
I'm not an astro togger, more like a bird togger, but i have taken some moon shots with both a DSLR / Manual Focus Tamron, and this one with DSLR and that 600mm astro scope i had
When the photo opens, click it to get full size
http://photo-sharing.winsoftmagic.com/1/9d86nlimbo.jpg
By the way, the scope cost me £250 ex demo.