Expand the lens choices you can use with your EF-mount camera with the B4 2/3" Lens to Canon EF Adapter Mount Ring from SOONWELL. This aluminum adapter enables you to mount broadcast-style B4 2/3" lenses on EF-mount cameras like the Canon EOS 5D Mark II, 6D, Blackmagic Pocket Cinema Camera, and more. Images are free from vignetting with lenses up to 130mm and with a Kenko (not Canon) 2x extender. Manual focusing and M file operations are available when using the adapter.
Note:
Note that 2/3" lenses will not cover an APS-C sensor, even with a 2x extender.