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Effects of changing the aperture – Canon AT 1 User Manual

Page 78

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the moving main subject in the viewfinder.

You then release the shutter while still twist­
ing. When you use this technique, the main

subject should be sharp even at slow shutter
speeds and the image of the background is

blurred according to the speed of the panning

movement. This hightens the feeling of
motion in the picture.

Effects of Changing the Aperture

The lens aperture does not only control

exposure but it also has an effect on the

photograph as follows:

In example C, the aperture was set at

f/5.6 with the shutter speed dial adjusted

before shooting. In example D, a f/16 setting

was used to clearly demonstrate the diffe­
rence. In C, the miniature cars in the back and

front are blurred and only the miniature cars

in the central area are in focus. In D, most of

the miniature cars are sharp and clear. Thus,

the lens aperture has a marked effect on how

much of the picture is reproduced sharply.