Hi Andrew - looks like you're in the same place as me. I also looked at the nexstar 4SE but it is on an az-alt mount which i understand is no good for photography (is astrotography the same as astrophotography?). Plus it's a small aperture and it's a slow scope. The feedback that I've been given is to get a good and sturdy equatorial mount (HEQ5 or EQ5) which will set you back in the range of $1000 with goto and that'll leave you $500 for a scope but no guidescope (prices seem to be around $400 for autoguidescope or perhaps less if you can modify a webcam). In any case, I'm still sitting on the fence since the numbers add up.. need a battery pack for the mount, eyepieces, star diagonals etc etc.. For me, I'm considering an HEQ-5, I got a 50mm F1.4 lens for my camera to take wide field images and I'm looking at a 65mm quad telescope with built in field flattener for around $650-700. Then I'd need to get the eyepieces etc if I want to use it for visual or a T-adapter for photography.
Hope that helps.
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