Exposure & Metering
60 terms · page 3 of 3
RGB Histogram
Three separate histograms, one per colour channel, revealing clipping that a combined luminance histogram would hide.
Exposure & MeteringShutter Priority
A semi-automatic mode, marked S or Tv, in which the photographer sets shutter speed and ISO while the camera chooses aperture.
Exposure & MeteringShutter Speed
The length of time the shutter stays open, controlling both total exposure and how much subject or camera movement is recorded as blur.
Exposure & MeteringSpot Metering
A metering pattern that reads only a small circle, usually one to three per cent of the frame, ignoring everything around it.
Exposure & MeteringStop
The fundamental unit of exposure change: one stop doubles or halves the amount of light reaching the sensor.
Exposure & MeteringSunny 16 Rule
A field estimate stating that in bright, direct sunshine, correct exposure is f/16 with a shutter speed of one over the ISO.
Exposure & MeteringT-stop
A measured aperture value that accounts for the light a lens actually transmits, rather than the geometric ratio an f-number implies.
Exposure & MeteringThird Stop
A one-third-stop increment, the fine adjustment step most digital cameras use for aperture, shutter speed, ISO and exposure compensation.
Exposure & MeteringTime Mode
A shutter setting, marked T, that opens the shutter on one press of the release and closes it on a second.
Exposure & MeteringUnderexposure
An exposure that records less light than the scene needs, producing dark, noisy shadows and muddy colour.
Exposure & MeteringZebra Stripes
A live-view overlay of diagonal stripes marking areas above a set brightness threshold, used to judge exposure before the shutter fires.
Exposure & MeteringZone System
Ansel Adams's method of dividing the tonal range into eleven zones and placing chosen subject tones deliberately on that scale.