The adapter is no optical lenses except some models. The optical image reproduction is exactly the same as your lens.

The tilt for the ease of handle and rotation of the mount.

The mount body which attach to the body is made by BRASS. It is hard, high precision and good finishing material. The mount body which attach to the lens is made by anodized Aluminum alloy. 

Some model have screw or button to lock the lens probably.

All items are able to "focus to infinity", each adapter will be taken final test before releasing to market. 

Limitation:

NO AF function or confirmation.

Apply Aperture Priority mode or Manual ONLY.

MADE IN JAPAN

1 Year Warranty