Originally posted by tonyzoc I do use film. But...film manufacturing and processing generates slot of chemical waste. Digital is clearly a much cleaner technology. That said ...one if the things I like about a film shooting is a more compact camera and a more thoughtful yet simplier process of shooting. Sure, I can switch to manual mode and get a smaller mirrorless camera...like an Olympus Pen F...and I have thought about it. From Pentax the choice is very limited...a K-01 which is still kinda pudgy... No K-02 in the works and probably no mirrorless in the future most likely. And...the IMBack doesn't look like it's good enough and still adds allot of bulk.
My recommendation, Tony, would be to buy a used Sony A7 or A7II. The prices are coming down all the time, and if you're not too fussy about cosmetic condition, you'll pick one up for a few hundred bucks... maybe $500 for an original A7, which is peanuts for a digital body with full frame sensor. Sure, it's a little dated by the latest standards, but still very good. Add a Fotodiox K-mount adapter (with stop-down ring) and you're good to go. Of course, this is a more expensive solution than buying an "I'm Back", but you're getting an awful lot more for your money in terms of image quality (24MP full frame sensor!)... plus, you can add a whole bunch of other adapters to use different mount lenses as you wish - including just about every rangefinder and SLR mount you can think of.
I bought an A7 MkII (new, admittedly) some time ago for the main purpose of using adapted vintage lenses, and it's been a fantastic workhorse in this respect.