Automatic timing
As automatic timer or Metering a is automatic exposure referred to in automatic cameras, in which the F-number is manually selected; the camera then adjusts the of the metering to be appropriate given exposure time automatically. Cameras that have a time automatic are also called time automatic . On the mode dial of the cameras with this mode A( engl. Aperture priority ), or Av(engl. Aperture value ) characterized.
The aperture is a photographic composition tool used to control important properties of the image, such as the depth of field . Aperture priority is used when, for example, the photographer deliberately does not have sharpness in a portrait or wants to achieve a blurring of the background of the image by opening the aperture as wide as possible ( i.e. small f-numbers, e.g. f1.4 or f2.0), or In landscape photography , when the smallest possible aperture ( i.e. large f-stops, e.g. f16 or f22) is used to achieve the greatest possible depth of field.
Most modern SLR cameras have a shutter speed automatic (aperture preselection); In the case of compact cameras , mostly only higher quality models have this function.
See also
Individual evidence
- ^ J. Hedgecoe: Foto Handbuch , Hallwag Verlag, 2000, ISBN 978-3-44410-402-2 .