Yeah, I know - most people would recommend negative projection with a variable Barlow lens to get decent magnification for planetary AP. However, I've been experimenting with positive (eyepiece) projection, which also gives fairly high magnification if I use short focal length eyepieces. The three eyepieces I use most often are Baader Hyperions (8-24 mm zoom, 21 mm, and 36 mm), which have a M43 thread at the end of the eyepiece. This allows one to directly couple a camera body with a M43/T2 adapter system, i.e.
http://www.baader-planetarium.de/com/pdf/hyperion_brief_description_e.pdfIn my setup, I use a M43/T2 adapter ring attached to a Baader T2 Quick Changer system that is attached to a Nikon T-Ring to couple my Nikon D800 body to the eyepiece. To calculate projection magnification, I use the formula
Projection magnification = (A-F)/F
Effective focal length = telescope focal length x projection magnification
Effective f-ratio = telescope f-ratio x projection magnification
where A = distance between eyepiece and camera sensor (72 mm in my setup) and F = eyepiece focal length. So with an 8-mm eyepiece, I get a respectable 8x projection magnification, and my C6 f/10, 1500mm-FL SCT becomes a f/80, 12000mm-FL system. With an additional 2x Barlow in front of the eyepiece, I can in theory get something ridiculous like 17x projection magnification, and my C6 becomes f/170, 25500mm-FL system, but I never get anything worthwhile seeing.
BTW, I got all my Baader equipment from Alpine Astronomical, and Bob Luffel has always been very helpful and prompt with answering questions.