Exposure & Metering
5 terms
Shutter Priority
Exposure & Metering
A semi-automatic mode, marked S or Tv, in which the photographer sets shutter speed and ISO while the camera chooses aperture.
Shutter Speed
Exposure & Metering
seconds
The length of time the shutter stays open, controlling both total exposure and how much subject or camera movement is recorded as blur.
t = 1 / denominator
Spot Metering
Exposure & Metering
A metering pattern that reads only a small circle, usually one to three per cent of the frame, ignoring everything around it.
Stop
Exposure & Metering
stops (EV)
The fundamental unit of exposure change: one stop doubles or halves the amount of light reaching the sensor.
1 stop = ×2 or ÷2 light
Sunny 16 Rule
Exposure & Metering
stops (EV)
A field estimate stating that in bright, direct sunshine, correct exposure is f/16 with a shutter speed of one over the ISO.
t = 1/ISO at f/16