Camera Lens
The aperture controls how much light hits the film. The aperture is the hole that lets the light
in. The bigger the hole then the
greater the amount of light that is let in.
By irony the system for indicating the size is the larger the number
then the smaller the hole, therefore f4 is larger than f11.
Shutter Speed
The shutter controls how long the light is allowed to
strike the film. This is usually in
fractions of a second.
Exposure
Correct exposure is a balance between
how much light is allowed to hit the film and how long it is allowed to hit the
film. This means that there are several
correct settings for any light level.
This can allow for a choice in the combination of f-stop and shutter
speed.
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