Quote:
Originally Posted by Stonius
I just read that the diffraction spikes makes it difficult to combine data from different nights - I assume because the spikes may not line up two nights in a row. If that's true, it would make the reflector less attractive for me, I think.
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It's fairly easy to mark the orientation of your camera on the focuser so alignment is consistent and stacking software will compensate for that anyway (unless it's a long way out).
That Skywatcher Esprit 100ED of Kevins does look pretty impressive though and fast enough for AP.
To capture galaxies and smaller DSO's you really need to have a focal length over 1000mm, which means a slow refractor, Mak, RC or a larger but faster newt. For starting out in AP I think you should try and keep under f6 or you will have to go the whole hog with auto guiding etc to get enough exposure time.