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I have the 100ED - really great value scope for visual but at f9 I would consider it a bit slow for AP in general. I have the 72 and 80ed's as well - the 80mm would be the pick for my money although going on the performance of my Zenithstar 61, I would suspect the Zenithstar 81 would be better than the skywatcher/saxon/orion 80ed. I'd be interested to read reports of the new Evolux 82ed - might be worth considering. I use the Zenithstar 61 as the guidescope, but it does take wonderful wider field images of nebulas where as for galaxies I'd prefer a longer focal length. Budget for a flattener too - unless you've got a fairly small chip in the camera.
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