AP with a camera and lens is a bit easier on the mount requirements you can start off with a barn door tracker or an EQ3-2 and a 50mm lens longer focal length lenses will be limited to 2 min subs but that can be enough to get reasonable images, the problem is that the very best lenses of 200-400mm FL can cost many times that of the best scopes so it isnt allways cheap. The solution to the cost problem can be overcome a little by using old SLR lenses which will give reasonable performance for little money but again the very best do come at a price. Alan