The A-Z of camera jargon

Autofocus (AF) points An AF point is a specific part of the frame where the camera is able to focus. In theory, the more AF points a camera has, the more effective its overall autofocus capabilities.

APS-C A common image sensor format similar in size to the Advanced Photo System classic negatives of 25.1x16.7mm, with an aspect ratio of 3:2.

Aperture The size of the opening in a lens that light passes through to reach the camera sensor, such as f/2.8. Smaller numbers mean a larger opening.

EVF Electronic viewfinder found on cameras that displays exactly what the camera sensor is seeing, but without the distractions of a bigger rear screen.

Full-frame A high-end image sensor format, which is the same size as traditional 35mm format (36x24mm) film. Focal length A number expressed in millimetres (mm) that indicates a lens’ field of view, such as 50mm. The lower the focal length, the wider the field of view.

FPS Frames per second. The maximum speed at which a camera can capture photos in a continuous burst.

Megapixel (MP) 1MP is equal to one million pixels, and the number of megapixels determines the resolution of a photo. Micro Four Thirds system (MFT) A new standard released in 2008 by Olympus and Panasonic for interchangeable lens cameras. Has the same image sensor size and specification as the Four Thirds system (17.3x13mm) but is designed without a mirror, so is more compact.