A question
it's stated here that for FujiFilm S7000 genuine adapter,
this adapter to use 55mm filters and other manufacturers lenses. Of course, you can also buy an aftermarket adapter ring as well. The genuine Fujifilm ring is about 38mm long. Any aftermarket ring will need to be at least this long. If any longer you may experience vignetting.

that means i should get a third party adapter that is shorter than 38mm? wouldn't it be running the risk of having the barrel crash into what's connected to the end of your adapter.

what about a 50mm adapter? will the vignetting be very serious?