EF to FZ mount adaptor Optitek Mk II

The aperture on this adapter is controlled by up-and-down pushbuttons mounted on the side. Its great advantage is that it’s one piece (there’s no control box) and it has a really good locking EF mount which gets rid of any backlash. The downsides are you have to recalibrate it every time you take the battery of the camera and the up and down buttons are a bit of a pain.