I was thinking about picking up a Helios 44 again (I really liked my last one and regret selling it). I noticed that I can get them in m39 and m42 versions. Wouldn't the distance to the imager be way off in the m39 version? It wasn't an RF lens. Initially I thought m39 would be great (never liked the fact that m42 adapters are so large) but I'm thinking the m39 Helios 44 wouldn't work with the same adapter I use for my Jupiter 8...right?