Yep, imaging at 6000mm FL with a 10" mirror, comes to f/30. The mirror is 1500mm native, boosted with a 4x powermate.
For my current camera f/30 is about as dim a I can push it through these filters. In the next few months I'm sorta hoping to upgrade to the new DMK-21BF04 from
www.theimagingsource.com which should get me some more sensitivity.
re: a tutorial, well, it's a good idea, except that there's so many different things to talk about... seriously, 90% (maybe 95%) of the secret is to get good quality raw images, and that means paying close attention to physical stuff like collimation, temperature of the scope and mirror, good seeing conditions, steady tracking etc. The software part is not really the hard bit.
Bird