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Hi Tony, I had the same issue with guiding not happening time and time again, but after I got a 50mm finder guider everything started working. I still have the occasional night when nothing goes right but I have managed to get some good 5min subs at 1200mm and 1350mm fl. I think that with longer focal length guide scopes the guider just works too hard?
Darks just help to remove hot pixels, so if your sensor was really good you might not notice the difference, I can certainly notice the difference with my 1100d. Flats help to eliminate dust etc in your imaging train that shows up in your pics. I have never bothered to take any flats because you have to take them with everything set up on your scope exactly as you have been imaging and with a pure white light source.
Rick
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