Interchangeable lenses come in a huge array of types for shooting different kinds of subjects
IN GENERAL, the easiest way to expand the kinds of pictures you can take is by buying different types of lenses. For example, telephoto lenses let you zoom in on distant subjects, while macro lenses enable close-ups of small objects. Largeaperture lenses allow you to isolate subjects against blurred backgrounds, or shoot in low light without having to raise the ISO too high. Meanwhile, all-in- one superzooms cover a wide range of subjects, but usually with rather lower optical quality.
Lens mounts Each manufacturer has its own lens mount and most aren’t compatible with one another. For example, a Canon DSLR can’t use Nikon lenses, although you can use independent brands if you get them with the right mount. Built-in focus motor Most lenses now incorporate an internal motor to drive the autofocus, although some are still driven from the camera body. DSLR lenses often use ultrasonictype motors for fast focusing, while those for mirrorless cameras tend to employ video-friendly stepper motors. Filter thread A thread at the front of the camera will have a diameter, in mm, which will allow you to attach a variety of filters or adapters to the lens.