Canon AE-1 - Manual (Page 78)

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2 3 5 10
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only be possible up to the previous exposures
aperture. Also, when the aperture ring is set at
the "A" mark, the stopped-down lever cannot
be pressed.
Generally, the depth-of-field will become
deeper as the aperture becomes smaller, and
shallower as the aF>erture becomes larger. A
shorter focal length as well as a greater subject
distance will also deepen the depth-of-field.
Comparing an interchangeable 28mm lens
with a standard 50mm lens set at the same
f/stop, the 28mm lens's depth-of-field will be
greater. And when the photographic distance
44