Using this NEC long zoom lens is easy. First, make sure your projector is among the compatible models listed. Then, carefully attach the lens to your projector according to the manufacturer's instructions. When using it, avoid blocking the lens to ensure the best projection quality. For maintenance, keep the lens clean with a soft, dry cloth. Don't touch the lens surface with your fingers as it may leave fingerprints and affect the projection. Store the lens in a dry and cool place when not in use.