Takkun
Ian M.
Yes, it happens, though I tend and try to remember to look suspiciously at the rewind knob early on.
Once, in Las Vegas of all places, it took about 10 frames before I noticed...
Apparently the film must have slipped from the take up spool after the first advance, so I got something rather than nothing..
/Anders
I laughed and spat out my coffee, but this ended up being an interesting shot (or 10).
I've actually had it happen most often with an F6, despite the film indicator window. Thankfully I can carry over the tension-checking technique with it.
There's also the time last week when I opened a back loaded with a bulk-loaded roll, thinking there was nothing inside because of the black canister.