Film Camera Operation
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Understanding of
Shutter speeds are measured in seconds, or fractions of a second. For example, a shutter speed of 1/100 means 1/100th of a second, or 0.01 seconds. This is also known as the "exposure time", because it's the amount of time the sensor is exposed to light.
Aperture can be defined as the opening in a lens through which light passes to enter the camera. It is expressed in f-numbers like f/5.6, f/6.3, f/7.1 and so on to express the size of the lens opening, which can be controlled through the lens or the camera.
In Digital Photography ISO measures the sensitivity of the image sensor. The same principles apply as in film photography – the lower the number the less sensitive your camera is to light and the finer the grain.
The exposure triangle is a common way of associating the three variables that determine the exposure of a photograph: aperture, shutter speed, and ISO. One must balance all three of these to achieve a desired result, an adjustment of one requiring adjustments of at least one of the others.