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Depth-of-field preview
Depth of field at any aperture and focusing
distance can be previewed visually by setting
the stop-down button at its stop-down position
(seep. 20). This will stop the diaphragm down
to the aperture corresponding to the f-number
preset on the aperture ring, allowing you to see
through the viewfinder about how much of the
subject is acceptably sharp. (The meter will be
switched off at this position.)
Pushing the stop-down button again will re-
open the diaphragm to full aperture (and switch
the meter back on).
Infrared index
For proper focus when making pictures with
infrared radiation, first focus your subject with
visible light as described above, then turn the
focusing ring to the right to align the point of
proper focus on the distance scale with the
index designated with small red "R" in the
depth-of-field scale.
Film-plane index
The -e- symbol on the camera top plate to
the left of the viewfinder indicates the exact
plane occupied by the film in the camera. This
can be used to measure distance from subject to
film precisely where desired for photomacro-
graphy, close-ups. etc.
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