I got some free 16mm microfilm, then went and bought about $20 more of a couple of different types, and now I have 600 total feet of the stuff. Will I ever use it? Who knows! If I find a camera I like enough and a developing solution that works, it'll definitely be a cheap way to shoot with film...though I'm not sure there's much of a point, really.
I picked up a Minolta 16QT and shot a few strips of Fuji HR-21 with it. As it turns out, the shutter is slowish, so lots of motion blur on the 1/30 setting. A camera that essentially limits you to 1/166 isn't necessarily the best fit for microfilm! The lens is ok in the center, but not fantastic on the borders. With a better lens and the same film, I don't see why you couldn't print a well-scanned frame at 16x20.
Full frame, shot at around ISO 80-100. I think this film/dev combo (HW Control) will probably end up being the most useful at ISO 50.
100% crop of the original. The dimensions are 5600x3900...I don't feel like doing the DPI math on that!