Allows to lengthen x2 lens focal length. Canon EF mount.

Bayonet adapter with AF capabilities for Canon EF/EF-S mount lens to a Fuji GFX camera

Doubles focal length of lens.

Viltrox EF-M2 is an adapter dedicated to work with Canon EF and EF-s lenses and is used to mount them on cameras with an MFT mount.

Voigtlander Close Focus is a top-class adapter that allows the use of Leica M mount lenses on Nikon Z cameras.