Continuing on the "where the heck do you get 620 film" journey, I purchased a couple of rolls of actual 620 film, from B&H. Actually, I'll bet it's just 120 film re-rolled onto 620 spools, but done by professionals in a controlled environment. No matter; it's fancy stuff. The film itself is Tri-X, which I haven't used since high-school, so it'll be fun. I'll report back when I've had a chance to use it!