I've had some luck with my 5DIII attached to my C8, but would like to try imaging with something shorter and faster. I'd like to experiment a bit before investing in another scope, so for now I'm thinking of using my Sigma 150-600C lens. I know a fast refractor (or even a better lens) would be a better choice, but I'm thinking it should be suitable for some basic trial and error.
Is there anyone who has experience with that lens, or long telephotos in general, that has suggestions on how best to image? I'm also curious what targets are best to start with? My camera is unmodded, I don't have any filters for the Sigma, and I'll be shooting from suburban to urban skies. Therefore I don't want to go after something really dim or that wouldn't show up well with my "conventional" setup. Eventually I plan to either mod my 5DIII when I upgrade (or get a CCD) but for now it does double duty.
Thanks for any advice!