Once the maximum aperture of F2.8 has been reached with a shutter
speed of 1/100sec, if the subject is still too dark for this exposure, the
“program” keeps the F2.8 aperture while decreasing shutter speed still
further. !
If the you set ISO to Auto in this mode, the camera will give priority to
increasing the ISO sensitivity before setting too slow a shutter speed
thus reducing the possibility of getting hand shake in the image. !
If you wanted to change this aperture/shutter speed combination to
increase depth of field, for example by selection a smaller aperture,
then this can be achieved using a feature referred to as “program
shift”. !
When you half depress the shutter button to activate both focus and
metering then, as the aperture/shutter speed combination is being
displayed on the LCD screen if you rotate the back control dial you will
enter this mode. !
You can adjust the combination of aperture and shutter speed and the
aperture will stay locked in at this value until you either turn off the
camera or rotate the control wheel until the indication turns off. !
The camera adjusts exposure by changing the shutter speed. !
This value of aperture remains in memory even if you select another
mode and then return to the “P” mode. !
Essentially you have set the camera into “Aperture priority mode” !
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