edge: An area where neighboring image pixels are significantly different in color; in other words, an area of high contrast.

EXIF: Exchangeable Image File Format. Developed to standardize the exchange of image data between hardware devices and software.

exposure: The amount of light allowed to reach the film or sensor, determined by the intensity of the light, the amount admitted by the iris of the lens, and the length of time determined by the shutter speed.

exposure compensation: A setting used to increase or decrease the exposure manually when the camera gets it wrong.

exposure value (EV): EV settings are a way of adding or decreasing exposure without the need to reference f-stops or shutter speeds. For example, if you tell your camera to add +1EV, it will provide twice as much exposure by using a larger f-stop, slower shutter speed, or both.

extension tube: A camera attachment that moves your camera lens farther from the sensor, enlarging the image captured by the camera. Also called a lens extender.

eyepoint: The distance your eye can be from the camera viewfinder’s window and still see the entire view.