The infrared filter from dHD DIGITAL was made from tempered optical brand real glass. This branded look was embedded in a precision aluminum frame. The aluminum frame has both an internal thread and an external thread, which can accommodate a lens cap or allows the combination of additional filters. The branded infrared filter IR850 blocks all visible light up to 850 nm. However, infrared rays are allowed through. This allows you to take breathtaking photos with spectacular details. 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