The Reverse Tulip lens hood is in two parts. The adapter ring is simply attached to your lens filter thread and the lens hood can easily be moved into photo position or reverse position. The adapter ring is simply screwed onto the filter thread and the aperture is attached to the adapter ring using a bayonet connection in the photo or reverse position (filters can still be used) Batteries must not be disposed of with household waste. You are legally obliged to return used batteries so that proper disposal can be guaranteed. You can hand in used batteries at a municipal collection point or at your local store. You also have the option of returning old batteries from our products to us with sufficient postage or dropping them off free of charge directly at our address at the following addres