The Cheapest Focal reducer / Speedbooster lens adapter I could find… it it any good?
Gorilla Film Gear Focal Reducer Canon EF EF-S Lens to Micro 4/3 Mount Camera M43 Speed Booster Review
Focal Reducer Canon EF EF-S Lens to Micro 4/3 Mount Camera
Focal Reducer Nikon G F Lens to Micro 4/3 Mount Camera
On Amazon Australia (doesn’t seem to be listed on the main US site?);