The associated 620 format film - it's 70mm and
with a decent camera, gets
some really nice pix. (This is the tough part - I haven't played with it
for years, and I have *no* clue if anyone (offered as a service) could
still develop it - you might be limited to a home darkroom to work with the
stuff.)
17 years ago I used a camera that took 620 film. It was starting to become
hard to get. The film is the same as 120, but on a different spool, so it
was possible to buy 120 and load it onto 620 spools. I didn't have any
trouble getting it processed back then, but I haven't tried since.
I did some of my own processing, and discovered that it is somewhat harder
to manually process 70 mm film than 35 mm.