- active autofocus
A kind of focusing system in which the camera sends out an infrared signal that is reflected by the subject, allowing the camera to calculate the distance to the subject and set the focus. - See also [passive autofocus]
- aperture
The opening of a lens as measured in f-stop values.
- ASA/ISO rating
A single measurement value for film speed, represented by two organizationsthe American Standards Association and the International Standards Organization.
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