There are lots of adapters for the Fujifilm X system, including focal reducers, which work like this: you take a Full Frame lens, puts them on Fuji APS-C sensor, and the speedbooster transmutes that focal length back to full frame. It totally negates the crop factor. And the way the adapter works, we actually also double our light, translating 1 stop faster in exposure time.

Andrew compares four focal reducers or speed boosters:

• Kipon Baveyes EF/X 0.7x
• Metabones Speed Booster XL 0.64x
• ZHONGYI Mitakon Lens Turbo Adapter V2
• Viltrox EF-FX2 Auto Focus 0.71x

Here are Andrew’s thoughts (video below):

Focal Reducers Compared