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Mamiya RZ67pro Manual

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Close-up Photography
Exposure
Compensation
for Close-up Photography
Area Covered with Bellows fully Extended
When working very close to the subject, the
exposure must be increased. The actual expo-
sure factor will vary in accordance with the dis-
tance that the lens is extended. This is simply
because the brightness of the image
striking
the film grows increasingly dimmer as the lens
is progressively moved further from the film
plane.
Exposure compensation is easily deter-
mined by referring
to
the
Exposure Compensa-
tion Scale.
1. After focusing the lens, read the exposure
compensation factor on the scale. The scale is
divided into three zones of light, medium, and
dark shades. As indicated by the table at the
base of the scale, the light zone represents an
exposure factor of zero (no compensation is
necessary), the medium shaded zone indi-
cates
+0.5
(a
1/2
stop increase in exposure is
required), and the dark zone denotes a factor of
+
1
(a full stop increase in exposure is neces-
sary).
To find the exposure factor, first locate the fi-
gure on the Focal Length Scale for the lens in
use. Next, move along the scale, in the same
column, until you reach the Distance Gradua-
tion. The shading of the zone (light, medium,
dark) which touches the Distance Graduation
indicates the correct exposure factor. For
example, when the
110mm
lens is focused as
shown in the illustration, the correct exposure
factor is +
1.
2. Compensate the exposure by changing
either the shutter speed or aperture. When the
exposure factor is
+1,
either open the aperture
or lengthen the shutter speed by a full stop.
With a factor of +0.5, open the aperture by a
half-stop. For example, assume that a hand-
held exposure meter indicates a normal expo-
sure reading of
f/16
at
1/60
sec., for exposure
27
compensation of + 1, set the lens to either
f/16
at
1/30
sec. or
f/1
1 at 1/60 sec.
When using a finder with a built-in meter,
such as the PD Prism Finder, there is no need
to compensate for close-up photography.
l
For optimum clarity at
the corners when using the
50mm
and
65mm
wide-angle lenses at
distances
closer
than 1 meter, use as
small an aperture as pos-
sible.
l
The bellows extension in millimeters appears on
the top of the Focal Length Scale. These figures are
used to determine the required exposure compensa-
tion factor when using extension tubes.
… 29 …


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