Canon eos rebel g - Manual (Page 57)

VI. Reference
nr:. - • : ;, l
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. The
more sensitive the film is, the less light is
required to obtain a correct exposure.
Therefore, a high-speed film is suited for
low-light situations. The ISO film speed is
set in accordance with standards set by
the International Standards Organization
(ISO).
A film speed from 6 to 6400 can be set
with the camera. The film speed is
displayed on the LCD panel and in the
viewfinder.
Depth of field
This is the range in front of and behind the plane of optimum focus where
acceptable focus can be achieved. The smaller the aperture (the larger the f-
number), the deeper the depth of field will be. And the larger the aperture (the
smaller the f-number), the shallower the depth of field will be.
The depth of field is affected as described below:
(1) A smaller aperture (a larger f-number) increases the depth of field.
(2} A lens with a shorter focal length increases the depth of field.
A wide-angle fens obtains a deeper depth of field than a telephoto lens.
(3) A longer distance between the camera and subject increases the depth of
field.
(4) The depth of field behind the plane of optimum focus is longer than the
depth of field in front of the plane of optimum focus.
57