Canon Rebel Ti 300V - Manual (Page 52)

Basic Photography Terms
Exposure
Exposure occurs when the film is exposed to light. Correct exposure is
obtained when the film is exposed to a proper amount of light in accor­
dance with the film’s sensitivity to light. The correct exposure is adjusted
with the camera's shutter speed and lens aperture.
Shutter speed
The shutter speed is the length of time the camera’s shutter opens to
expose the film to the light coming through the lens. The shutter speed
is displayed on the camera’s LCD panel and in the viewfinder. It ranges
from 1/2000 sec. to 30 sec. and bulb.
Aperture
The aperture setting (f/number) indicates the size of the aperture open­
ing in the lens (focal length/aperture diameter). It is used to adjust the
amount of light striking the film. The aperture setting is displayed on the
camera’s LCD panel and in the viewfinder. It can range anywhere from
1.0 to 91, depending on the lens attached to the camera.
ISO film speed
The ISO film speed indicates the film’s sensitivity to light. The higher the
film speed, the more sensitive the film is. Therefore, ISO 400 and high­
er-speed films are suited tor low-light conditions. The ISO film speed is
set in accordance with standards set by the International
Standardization Organization (ISO). A film speed from
6 to 6400 can be
displayed on the LCD panel.
Depth of field
This is the range where acceptable focus can be achieved in front of
and behind the point of optimum focus. The smaller the aperture (the
larger the f/number), the deeper the depth of field. And the larger the
aperture (the smaller the f/number), the shallower the depth of field.
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Reference
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