(May 4, 2017 at 2:35 pm)Alex K Wrote:(May 4, 2017 at 12:56 pm)Cthulhu Dreaming Wrote: Yeah, if portability is a prime concern. Go for a slow f ratio here as well. I have a 10" f/6.3 SCT, the central obstruction is significantly larger than in a f/10 and that leads to lower contrast. (Though despite that, aperture wins, and a 8-10" SCT has that in spades.)
The Celestron 8" and 9.25" models both have f/10 as far as I can tell. There's the EHD version which is supposed to have improved flat field, but the difference is not so great for the 9.25 model which has a pretty flat mirror.
Perhaps you have a local astronomy club where you might have an opportunity to try one?
