Above: With the wide-angle lens (left) the zone focus setting is marked by a small black circle. Set this circle to
the red triangular index mark. The black scale now indicates about 20 ft. Set the distance scale to 20 ft. and the
aperture to f11. This yields a sharp zone of focus from about 5½ ft. to infinity. The telephoto lens (right) has
two small black circles. For near focusing, set the circle near figure 15 to the red triangle. The black scale then
indicates 6 ft. Set the distance scale to 6 ft. and the aperture to f11, and the zone of sharp focus extends from
about 11½ ft. to 20 ft. For far focusing, set the black circle near figure 50 to the red triangle. The black scale
will then indicate 20 ft. Set this figure on the distance scale and the aperture to f11, and the zone of sharp focus
extends from 25 ft. to infinity.
Focusing and Depth of Field
After changing the standard lens against the wide-angle or telephoto lens units, the image is focused on either
the ground glass screen or with the split image rangefinder in the same way as with the standard lens. At the
same time, the reflex screen shows the exact field of view of the particular lens used. There is no parallax error
nor are any supplementary viewfinders required.
To ascertain the depth of field obtained with either telephoto or wide-angle lens, focus the Retina Reflex with the
rangefinder or reflex screen. Read off the distance setting on the distance scale opposite the elongated diamond
mark. Then set this figure on the black scale of the telephoto or wide-angle unit against the red triangular mark.
The extent of depth of field can now be read off to the right and left of this triangular mark on the white scale of
the lens (see also below).
ZONE FOCUSING WITH C LENSES. The zone focus setting on the wide-angle lens is marked by a black circle
near the 10 ft. position on the lens scale, marked "35 mm." in red. Set this circle to the red triangular mark on
the adjacent scale. The triangle lined up with the circle points to the black distance scale of this lens to 20 ft.,
thus indicating that the distance on the camera focusing scale should be set to 20 ft. to obtain a depth of field
from 5½ ft. to infinity at f11.
The telephoto unit carries two zone focus settings each marked by a black circle, one near the 50 ft. figure (far
zone setting) and the other one near the 15 ft. figure (near zone setting) on the distance scale marked "80
mm." in red.
For far zone focus setting, line up the circle near the 50 ft. mark with the red triangular mark on the adjacent
scale and they will point to 20 ft. on the black scale. Set camera distance to 20 ft., and at f11 a depth of field
from about 25 ft. to infinity is obtained.
For near focusing use the black circle near the 15 ft. mark and align with the red triangle. When properly aligned
they will point to 6 ft. on the black distance scale. At an aperture of f11 a depth of field from approximately 11½
to 20 ft. is obtained.
The scale rings on both the telephoto and wide-angle units are solely calculating rings for depth of field and zone
focus setting. They have no other function; in particular, they are not used for distance setting.
Close-ups with the Telephoto C Lens
The telephoto lens covers distances between 6½ ft. and infinity. Closer distances, between 3½ and 6½ ft., can
be taken with the aid of the TI/60 close-up lens. This will be found particularly useful for close-up portraits to
avoid distortion. The correct distance setting as well as the accurate field covered is -- as in all other cases --
observed through the reflex finder. To determine the depth of field available, focus on the subject in the normal
way. Read off the distance setting and set the equivalent figure on the black scale of the lens to the red
triangular mark. Now read off the extent of depth of field to the left and right of the red triangle on the yellow
scale.
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