This cokin th075 p series adapter ring will allow you to connect the cokin p series holder to a lens with a 55mm thread 1 screw the adapter ring onto your lens make sure your adapter ring corresponds to your lens diameter which appears either on the front of the lens or in its instruction manual 2 push the filter holder sold separately on the adapter ring until it snaps in place 3 slide the filter up to 3 sold separately into one of the filter holder slots suitable for slr