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f: Changing the Depth of Field
When using an aperture with a high f/number or shooting in low light
scenes, note that camera shake can occur.
A higher aperture f/number will make the shutter speed slower. Under low
light, the shutter speed can be as long as 30 sec. In such cases, increase
the ISO speed and hold the camera steady or use a tripod.
The depth of field depends not only on the aperture, but also on the
lens and on the subject distance.
Since wide-angle lenses have a wide depth of field (range of acceptable
focus in front of and behind the point of focus), you need not set a high
aperture f/number to obtain a sharp picture from the foreground to the
background. On the other hand, a telephoto lens has a narrow depth of
field.
And the closer the subject, the narrower the depth of field. A farther
subject will have a wider depth of field.
Set the aperture so that the shutter speed display does not blink.
If you press the shutter button halfway and change the
aperture while the shutter speed is displayed, the shutter
speed display will also change to maintain the same
exposure (amount of light reaching the image sensor). If
you exceed the adjustable shutter speed range, the
shutter speed display will blink to indicate that the
standard exposure cannot be obtained.
If the picture will be too dark, the “30"” (30 sec.) shutter speed display will
blink. To obtain a standard exposure, set a lower aperture f/number or
increase the ISO speed.
If the picture will be too bright, the “4000” (1/4000 sec.) shutter speed
display will blink. To obtain a standard exposure, set a higher aperture f/
number or decrease the ISO speed.
Shooting Tips