Checking depth-of-field – Canon T 90 User Manual
Page 128
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It your eye will not be at the viewfinder the moment
you press the shutter button, close the eyepiece
shutter by pushing the eyepiece shutter lever, to
avoid stray light from entering.
When using the stopped-down metering with an FD
lens attached directly to the camera body, use an
aperture of f/2 8 or smaller.
<Checking Depth-of-Field >
When you check the depth-of-field with the FD
lens, stop down the aperture by pushing in the
stop-down lever as mentioned above. When you
look
through
the
viewfinder
with
the
lever
pushed in, you can see the range of sharpness,
i.e. the depth-of-field.
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