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This is just what I was after!
So basically the points that I can take from this is:
1. My exposures will take roughly half the time again since there is one f stop difference but the f ratio of the 8" newt does not take into account the central obstruction of the secondary mirror.
2. If I want to take several nights worth of data it's probably better to use a refractor so that I don't have problems with trying to line up diffraction spikes. This however may not be such a big drama....
3. No collimation needed on the refractor - plug & play.
4. I'll still need some type of field flattener if I go to a refractor.
Have I missed anything?
Thanks for your help gents,
Cheers,
Mario
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