Using this 16mm telephoto lens with your Raspberry Pi HQ Camera is easy. First, make sure your camera is turned off. Then, carefully attach the lens to the camera module according to the instructions in the operation manual. When taking pictures, you can adjust the aperture settings based on the lighting conditions. For better results, keep the minimum object distance of 0.20m in mind. As for maintenance, use a soft, dry cloth to clean the lens regularly. Avoid touching the lens surface with your fingers to prevent smudges. Store the lens in a dry and clean place when not in use to protect it from dust and moisture.