EXPOSURE
In photography, exposure is the amount of light
per unit area (the image plane illuminance times
the exposure time) reaching a photographic film, as determined by shutter
speed, lens aperture and scene luminance.
In digital photography "film" is substituted with "sensor".
Exposure is measured in lux seconds,
and can be computed from exposure value(EV)
and scene luminance in a specified region.
A long exposure showing stars rotating around the southern and northern celestial poles
A photograph of the sea after sunset with an exposure time of 15 seconds. The swell from the waves appears as fog.
No comments:
Post a Comment