A
- A-mount (Sony)The lens mount used by Sony's older Alpha SLT cameras. These are still on sale (2020) but are no longer being actively developed.
- AA batteriesAA batteries are used rarely in digital cameras but are used extensively in external flashguns and battery grips.
- Aberrations
- Accessory shoe
- ACROS (Fujifilm)
- Action cam
- Active D-Lighting
- Adjustment layer
- Adobe Camera Raw
- Adobe ProPhoto RGB
- Adobe RGB
- AE-L/AF-L button
- AF (autofocus) points
- AF-P lenses (Nikon)
- AF-S lenses (Nikon)
- AF Assist
- AF coverage
- AF fine tune
- Alkaline batteries
- Alpha (Sony)'Alpha' is generic name still used by Sony for all its interchangeable lenses, but it also refers to the older Alpha range of SLT cameras.
- Aluminium (tripods)
- Analog
- Angle of view
- Anti aliasing filter
- Aperture (lens)
- Aperture blades
- Aperture priority (A) mode
- Apochromatic lens
- APS-C sensor
- APS-H sensor
- Arca Swiss
- Area/auto AF
- Artefacts (digital)
- Aspect ratio
- Aspherical lens
- Astia (Fujifilm)
- Auto exposure
- Autofocus
- Autofocus basics explained
- Autofocus speed
- Auto ISO
- Auto mode
- Auto white balance
- AVCHD
- Average metering
- Axial chromatic aberration