Shutter speed
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In photography, shutter speed or exposure time is the length of time that the film or digital sensor inside the camera is exposed to light when taking a photograph. The amount of light that reaches th
A spoon falling in water, taken at 1⁄2000 s
The shutter speed dial of a Nikkormat EL
Slow shutter speed combined with panning the camera can achieve a motion blur for moving objects.
An extended exposure can also allow photographers to catch brief flashes of light, as seen here. Exposure time 15 seconds.
F-number
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An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is defined as the ratio of the system's focal length to the diameter of the entrance pupil. The f
A Canon 7 mounted with a 50 mm lens capable of f/0.95
A 35 mm lens set to f/11, as indicated by the white dot above the f-stop scale on the aperture ring. This lens has an aperture range of f/2 to f/22.
Comparison of f/32 (top-left half) and f/5 (bottom-right half)
Shallow focus with a wide open lens