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- AE Lock
- AE lock is used to hold an automatically selected shutter speed and/or aperture.
- AF Assist Illuminator
- A beam of light automatically activated to provide the camera's autofocus system the necessary light to operate in poorly lit situations. The AF assist illuminator's light does not appear in the picture.
- AF-I NIKKOR Lens
- A NIKKOR lens with a built-in autofocus drive motor.
- AF Lock
- Autofocus lock is typically used to hold focus on the part of the scene that's most important to you.
- AF Sensor
- The AF sensor is a sensor used to detect focus.
- AF Servo
- Essentially, motor-driven autofocus; engage it and a digital SLR's autofocus system will continuously track (focus) on a moving subject.
- Aliasing
- A type of digital image distortion most often seen when straight lines or edges in a digital image are enlarged to the point at which they appear jagged.
- Ambient Light
- The natural light in a scene.
- Angle of Flash Coverage
- The measurement in degrees of the angle formed by lines projecting from the center of the flash to the extremities of the field of coverage.
- Angle of View
- See Picture Angle.
- Anti-Aliasing
- An optical process that samples the edges of an image to fill in the missing areas that cause a jagged appearance.
- Aperture
- The circular opening inside the lens that can change in diameter to control the amount of light reaching the camera's sensor or film.
- Aperture-Priority Auto Exposure
- A shutter speed that is automatically selected by the camera to match the photographer's manually set lens aperture for a correct exposure. Especially useful for controlling depth-of-field.
- Application
- A computer program, such as an image editor or image browser.
- Archival
- The ability of a material, including some printing papers and compact discs, to last for many years.
- ASA
- Measure of a film's "light gathering" capability. Replaced by ISO for film and digital.
- Aspect Ratio
- The width of an image divided by its height. In still photography, common aspect ratios are 4:3 (images from digital cameras) and 3:2 (images from film cameras).
- Aspherical Lens
- A lens with a curved, non-spherical surface. Used to reduce aberrations and enable a more compact lens size.
- Autofocus (AF)
- A system of sensors and motors that allow lenses to obtain focus automatically; in some cameras, the system also allows the lens to maintain focus on a moving subject.
- Automatic Balanced Fill-Flash
- Nikon's TTL (through-the-lens) auto flash operation.
- Automatic Exposure (AE)
- With automatic exposure (AE) the camera's computer and metering system automatically select the aperture and shutter speed for a correct exposure.
- Automatic Exposure Bracketing
- A feature that sets the camera to take a series of pictures (usually three) at different exposure settings.