- Brand: VILTROX - Model: EF to MFT II Mount Adapter - Compatible Cameras: Micro Four Thirds mount cameras Since the electronic contacts do not function, how about using it for old lenses or cinema lenses? As there is no cap, I will temporarily attach a different mount's cap and send it. Built-in 4-group, 4-element reduction optical system. This is a speed booster mount adapter that reduces the focal length of EF mount lenses by 0.71x and brightens the aperture by approximately one stop. You can enjoy the original angle of view of full-frame EF lenses on an APS-C camera. Supports EXIF signal transmission and AF (autofocus). It is also possible to switch focus modes (contrast AF and phase-detection AF). Firmware can also be updated. Used only a few times and is almost like new.