Telephoto lenses are a type of long-focus lens that is used to capture distant subjects. They are often used in sports photography, wildlife photography, and portraiture. Telephoto lenses can be either prime lenses or zoom lenses. Prime lenses have a fixed focal length, while zoom lenses have a variable focal length.
When choosing a telephoto lens, there are a few things to consider. The first is the focal length. The focal length of a lens is measured in millimeters, and it determines the angle of view of the lens. A shorter focal length lens will have a wider angle of view, while a longer focal length lens will have a narrower angle of view.