This hama body cap is a must for any photographer using a sonyminolta slr or dslr camera it is a simply little piece of plastic that is engineered to match the sonyminolta lens mount and is easily positioned into the throat of the camera when a lens has been removed and twisted to lock it into place this is the easiest way to keep the mirror and sensorshutter of your sonyminolta slr or dslr free from dust when you are carrying the body and lens apart in a pocket or in your gadget bag for