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This will now allow you, through rotating the back control dial, to select
new combinations of aperture and shutter speed. By default the camera
will set the widest aperture (lowest f-number) to allow a reasonably fast
shutter speed depending upon the ISO being either set manually or by
the camera itself.
It is really your choice of how to adjust this combination, if indeed you
feel that the choice of aperture, or shutter speed is inappropriate for the
scene you are photographing.
For example you may want maximum depth of field in your image. To
achieve this you need a small aperture (larger f-number). Or you may
want to be photographing a sports scene which requires a faster shutter
speed to stop any subject motion blur.
To set the aperture (or shutter speed) to your requirement you simply
turn the back control dial until you see your desired setting.
In this illustration, on turning
the dial to the left the icon of
a “P” with a double headed
arrow is displayed –
indicating we have a “shift” in
operation. If we turned the
dial to the right we would see
the aperture which was the
next increment from the initial
display depending upon your
aperture increments.
The program shift screen
program shift
Turning the control to the
right alters the initial value of
F2.8 and, as shown, the
value is F4.5.
You can see the shutter
speed has decreased
(longer) as a result of less
light reaching the sensor due
to the decrease in aperture
size.
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