Lenses are always identified by their focal length. It’s not just a physical measurement, it’s an indication of the type of lens it is, for example, a wideangle lens, standard lens, telephoto and so on. In other words, the focal length of the lens gives you an indication of its angle of view. Or at […]
Angle of view
This is quoted in degrees, and indicates how much of a scene a lens takes in. Wideangle lenses have a wide angle of view, telephoto lenses have a narrow angle of view. Angle of view is directly related to a lens's focal length, though the different 'crop factors' of smaller sensors means that the relationship between angle of view and focal length is different on different-size sensors.
The advantage of interchangeable lens cameras like DSLRs and mirrorless cameras is that you can change lenses for different kinds of photography. There are many different types of lenses, often with specific names. Lenses are usually characterised or grouped by their focal length. It might be more useful to use their angle of view instead, […]