Using this Barco short throw zoom J lens is easy. First, make sure your projector is the Barco PJWU - 101B or RLS - W12 model. Then, carefully attach the lens to the projector according to the instructions. When using, keep the lens clean and free from dust. Avoid touching the lens surface with your hands. For maintenance, you can use a soft, dry cloth to gently wipe the lens. If there is stubborn dirt, you can use a special lens cleaner. Store the lens in a dry and cool place when not in use.