The currently available optics can be divided into different categories based on the focal length range they cover. These include:

• Super wide-angle lenses with focal lengths of 20 millimeters or a few
• Wide-angle lenses with focal lengths from 20 to 50 millimeters
• Normal or standard lenses with focal lengths of about 50 millimeters. Normal and standard lenses can be used flexibly and are well suited for portrait and travel photography.
• Telephoto lenses with focal lengths of more than 135 millimeters. In principle, we talk about a telephoto lens from about 70 millimeters, but often only models with focal lengths of at least 135 millimeters are considered true telephoto lenses. They are able to zoom in on objects at a greater distance and enlarge them. This reduces the angle of view so that less of the subject fits in the picture. Telephoto lenses can be used for sports, wildlife and portrait photography.
• Super telephoto lenses with focal lengths of more than 300 millimeters. Super telephoto lenses with focal lengths of at least 300 millimeters are used to capture even very distant subjects in full format. Since they are very expensive, they are used almost exclusively for professional applications.
• Super wide-angle and wide-angle lenses can present a large angle on the image. For this reason, the optics with this focal length range are mainly used for landscape photography, travel photography and architectural photography.