Canon 5D, the closest to an SLR with a digital sensor. Excellent FF with 12 mp, good dynamic range, excellent color rendition with most alternate lenses. I love the OM jewels and they really shine on the 5D. I change the focusing screen to a Canon Ee-S super precision matte screen. I also change my VF to a KPS 1.35x. The OM-EOS adapters with focus confirmation from Tagotech, mass sales here, is very accurrate. I have 5 of them. Let me know if you need help. By the way, I used to own the 40D and whenever I review my old photos, I wanted to buy it back. I believe, both these two older Canon models have weaker AA filters and thus they render excellent details, sometimes even better than the 5D2.