A 200mm lens is a type of telephoto lens commonly used in photography. It has a focal length of 200 millimeters, allowing photographers to capture distant subjects with clarity and detail. This lens is popular for wildlife, sports, and portrait photography, as it can create a shallow depth of field, isolating the subject from the background. These lenses come in various formats, including full-frame and crop sensor versions, affecting the effective focal length. They often feature image stabilization to reduce blur from camera shake. A 200mm lens can be mounted on various camera brands, such as Canon, Nikon, and Sony.