The adapter is adjusted for the Micro Four Thirds system mount (micro 4/3) Olympus/Panasonic cameras ( Panasonic Lumix G1,GH1,GF1,  Olympus Pen E-P1 , E-P2...). It is also adapted to the OM Lens. It is made of brass and this allows making free use of big and heavy lenses. A clearly mechanical lens fastening OM-micro 4/3 with the help of the adapter does not allow us aperture control and auto-focusing control. Now you should do everything manually when you are setting parameters on your very lens. In some cases this is even more convenient. The shooting should be done in the A or P mode . When using these modes the camera sets down the exposure value automatically, but the latter is dependent on those parameters of the aperture that you have already set down on your lens.