Pentax ist *ist Manual - Page 77

Effect of aperture

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75 BASIC OPERATION (PREPARATION) BASIC OPERATION (SHOOTING) Effect of aperture The aperture increases or reduces the amount of reflected light from an object which passes through the lens, controlling how much light strikes the film. If the aperture is opened up to increase the amount of light, subjects in front of and behind an in-focus subject will not be focused. That is, the range of focus (depth of field) becomes small. If the aperture is stopped down to reduce the amount of light, the depth of field increases. For instance, if you shoot a person against a landscape with the aperture open, the landscape in front of and behind the person will be blurred, making the person appear to rise out of the landscape. By contrast, stopping down the aperture increases the in-focus range. Open aperture Stopped down aperture ✍ MEMO • The depth of field increases when you use a wider angle lens or the subject is farther from the camera. Zoom lenses do not have a scale for depth of field because of its structure. ADVANCED OPERATIONS OTHERS

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75
BASIC OPERATION
(PREPARATION)
BASIC OPERATION
(SHOOTING)
ADVANCED OPERATIONS
OTHERS
Effect of aperture
The aperture increases or reduces the amount of reflected light
from an object which passes through the lens,
controlling how much light strikes the film.
If the aperture is opened up to
increase the amount of light,
subjects in front of and behind
an in-focus subject will not be
focused. That is, the range of
focus (depth of field) becomes
small. If the aperture is
stopped down to reduce the
amount of light, the depth of
field increases. For instance, if
you shoot a person against a
landscape with the aperture
open, the landscape in front of
and behind the person will be
blurred, making the person
appear to rise out of the
landscape. By contrast,
stopping down the aperture
increases the in-focus range.
Open aperture
Stopped down aperture
✍
MEMO
•
The depth of field increases when you use a wider angle lens or the
subject is farther from the camera. Zoom lenses do not have a scale for
depth of field because of its structure.