Huh, this finally looks like it turned into something: the I’m Back Film digital back for film cameras looks like it’s a shipping product; the claim is that it’s an adjustable unit for any 35mm film camera, shooting a 4/3 image sensor, which you can then use with a wide-angle adapter for “full frame” size images. At ~$500 it’s pricy for use as a walk-around toy, but it’s nice to see the technology is advancing. (previously.)