Buying Guide: DSLR Lenses

Our comprehensive listing of key speci cations for DSLR lenses

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, but some now have video-friendly stepper motors as widely used in mirrorless systems.

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.

Maximum aperture

Wider apertures mean you can use faster, motion-stopping shutter speeds.