There are definitely some small :43: lenses (as the standard is designed to provide), but what about small adapted lenses? A quick search of "pancake lens" on Ebay provides numerous thin primes (e.g., Nikon 50mm/f1.8, Minolta 45/f2.0) on their native mounts. However, the appropriate :43: adapters for many of these are 3/4" deep. So, let's see your thin when mounted adapted lenses. I'm guessing most truly thin packages will come from legacy rangefinder lines. Obviously, most will be primes, but small zooms would be interesting, too.