I made a custom lens adaptor for my x100s that converts it to a ≈17mm equivalent
I wanted a fisheye lens and since x100 series is a fixed lens system, the only option were adaptors, but the ones on the market were expensive and not enough for the effect I wanted. This one is made out of tape, a lens hood and prescription swim goggles. It's usable stopped to f8-16, and autofocus works (but it's slower + misses more).
Yes I am fully aware that this is an abomination.
Sorry if this is the wrong sub to post this in.