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Aperture-priority AE allows
the photographer to control the depth of field.
A wider aperture results in shallow depth of field, centering attention on the main
subject. Narrowing the aperture setting gives more depth of field so that objects
of both near to and far from the main subject are in sharp focus. Once you dial in
the aperture using the Electronic Input Dial, the T90 automatically selects the correct
shutter speed. Conventional style requires a user to turn the aperture ring and preset
the f-stop aperture and using an viewing aid like Depth of Field Preview button to
preview the desired result, and some just use the depth of field setting engraved
on the aperture ring of the lens as the guideline.
Generally, the wider the aperture setting (bigger numbers like f2.8, f2.0, f1.4,
etc.) ensures that the subject alone will be in focus and is the center of interest
while the rest of the surrounding areas will be blur and out of focus, creating a
strong and powerful impact isolating effect, a style which very important in portrait
photography. On the other hand, a small aperture setting (smaller numbers e.g. f16,
f22, etc.), is chosen, making both the foreground and distant background sharply
in focus. This approach is best used for landscapes. To get the most out of a lens, the aperture
control is equally important. Different characteristics are displayed when lenses
are stopped down or opened up. Depth of field varies both with aperture setting and
the lens' focal length. So a stopped down wide-angle lens will have almost everything
in focus, while a telephoto lens set at a large f stop gives out blurred backgrounds
and keeping the main subject in sharp focus.
The T90's Aperture-priority AE mode lets you select exactly how much depth of field
you want in your photograph, giving you full creative control over the final image.
Moreover, the Aperture-priority AE supports the switchable Safety Shift function
in the same way as it does with the Shutter-priority AE mode.
Safety Shift : With
the T90 set on shutter-priority AE or aperture priority AE, press with the Film Speed
Button and the Exposure Compensation Button for about 1 sec. The
"SS" mark indicates Safety Shift will then appear on Display Panel. The
same operation clear the Safety Shift function.
Aperture Control and Lens Selection
of the depth-of-field varies depending on the focal length of the lens you are using.
More dramatic differences in depth of field control can be achieved by using telephoto
or wide angle lenses. With the automatic nature of the aperture priority AE mode,
no matter what the focal length of the Canon FD lens you may have select, you will
have total control over the depth of field in your photograph (The Canon has a very
interesting point and click way of selecting the depth of field control in the later
models). You can choose from among a wide range of values (a total of 36 settings
in half stop increments) to bring out the full visual characteristics of your photograph.
Although since the early days of automation, from the more well known AE-1, aperture
priority automation was not Canon's preferred way of exposure control, even though
its early batch of FD-type lenses do have information being remitted to the camera
body. The first popular Canon model that offered only the Aperture-priority AE mode
was the AV-1 of 1979.When this camera appeared, a new type of FD lenses featuring
instant mounting/demounting was also introduced, known as FDn or simply New FD, as
according to official Canon brochures.
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