Photography lenses are essential components of cameras that focus light to create images. They come in various types, such as wide-angle, telephoto, and macro, each designed for specific photography needs. The lens's focal length, measured in millimeters, determines how much of a scene can be captured and how close or far away subjects appear. Lenses also have different apertures, which control the amount of light entering the camera. A larger aperture allows more light, making it ideal for low-light conditions, while a smaller aperture increases depth of field, keeping more of the scene in focus. Understanding these features helps photographers choose the right lens for their creative vision.