How do you guide?
Oh, $4000 in gear is PLENTY capable!
This was shot through an 80mm short tube refractor, Nikon F body, Fugi 800ASA film (can't remember the specifics...). Piggybacked on a friends Meade 12" SCT used for tracking (visually correcting, about once every 20 seconds or so). Maybe a 10 minute exposure? I took a cellphone picture of the framed picture on my shelf, so obviously there is some degradation...
I will say, once you get into the...40+ inch range...nothing else compares. Of course, once you get into the 100+ inch range, nothing else compares either...
