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- ED (Extra-Low Dispersion) Glass
- An optical glass developed by Nikon that is used with normal optical glass in telephoto lenses to obtain optimum correction of chromatic aberrations.
- Effective Pixels
- The actual numbers of pixels the camera's sensor uses to make the image. The number of effective pixels is often slightly smaller than the total number of pixels, as some pixels are not used in the actual making of the image.
- EPS
- Encapsulated PostScript. A graphic file format that allows the exchange of PostScript graphic files between application programs.
- EV
- Exposure Value. A number that represents available combinations of shutter speed and aperture offering the same exposure effect when scene brightness remains the same.
- EXIF
- Exchangeable image file. The file format used by most digital cameras. A camera set to record a JPEG is actually recording an EXIF file that uses JPEG compression to compress photo data within the file.
- Existing Light
- Light that exists naturally at the scene. Also known as available light, it's often taken to mean only daylight, but many photographers consider it any light or light source that happens to be at the scene.
- EXPEED
- A concept that applies Nikon's imaging knowledge and technology to specific cameras and camera functions to integrate all the camera's processes and applications.
- Export
- The process of transferring data from one computer, file format, program or device to another.
- Exposure Compensation
- Settings used to modify the shutter speed and/or lens aperture recommended by the camera's light meter. Often used to produce special creative effects or to meet the scene requirements.
- Exposure Meter
- A device that measures light to determine the combination of shutter speed and f/stop needed to make an optimum exposure.
- Exposure
- The total amount of light falling on the film or image sensor. Most often measured in the amount of time the light is allowed to reach the sensor, as in "a one-second exposure."
- Extension Ring
- A device placed between the lens and camera body to extend the lens-to-film distance for closer focusing. Available in various sizes, extension rings can be used singly or in combination to vary the reproduction ratio.
- External Flash
- A flash unit that operates off the camera. It can be connected to the camera by a cable or fired wirelessly.
- Eyepiece Correction Lens
- Attaches to the viewfinder eyepiece for eyesight adjustment. Some cameras have this adjustment built-in.
- Eyepiece Magnifier
- Attaches to the camera's viewfinder eyepiece to magnify the image for easier manual focusing. Especially useful for manual focusing on subjects with fine detail.
- Eyepiece Shutter
- A built-in device that prevents light from entering the camera's viewfinder eyepiece and adversely affecting the automatic exposure meter reading. Useful for unattended shooting and self-timer-operation.
- Eyepoint
- The farthest point on the optical axis where the entire image inside the viewfinder can be seen.