Pixco M42-Fuji X "Speed Booster"  type_Power & Cables The Carl Zeiss Planar 135mm

The Carl Zeiss Planar 135mm f3

Shutter speeds are good

but that's not the case: you can use this lens on anything with an M mount

but it does have live view

Original Pentax reverse adapter kit for the Pentax 645 medium-format camera

Pixco M42-Fuji X "Speed Booster" &nbsptype_Power & Cables The Carl Zeiss Planar 135mmNot a real "Speed Booster", because that's a Metabones trademark, but same idea: this adapter to mount M42 lenses on a Fuji X camera includes a focal reducer to eliminate the Fuji sensor's 1. 5x crop. Extra benefit: you gain a bit of light. Downside: corners can get soft wide open. It's not perfect, but it's a pretty decent solution if you want to pretend you have a full frame camera.