Use Sony-A (Minolta-AF) lenses on your Canon reflex camera.
Use OM series Lenses on your Olympus Reflex 4/3 camera with focus confirmation .
Use M42 lenses and accessories on your Sony E-mount camera
FB Series Classic Ballhead
Sunwayfoto PCL-R5G Custom L Bracket for Canon EOS-R5/R6 with battery grip
PNL-D850G, Custom L-Bracket for Nikon D850G with battery grip.