Mamiya C330 - Manual (Page 29)

Mamiya C330S: Page 27
Handling the 105mm f/3.5 DS Lens 27
The 105mm f/3.5 DS lens is equiped with diaphragms on the viewing lens, thus enabling you to
observe the depth-of-field on the focusing screen. In addition, this lens-shutter has a built in self-
timer.
Depth-of-Field Control
When the camera is focused on
a subject, a certain area in front
of and behind the subject is also
in focus; this is called the depth-
of-field. Depth-of-field varies
in relation to the aperture in
use; it increases as the aperture
is stopped down to smaller
apertures,
and decreases as the lens is
opened up to larger apertures.
Viewing on the Focusing
Screen
After focusing, set the desired
aperture to the central index
mark by turning the aperture
scale ring of the viewing lens.
Now, the depth-of-field can be
ovserved on the focusing
screen.
Using the Depth-of-Field
Scale
Turn the distance scale ring and
set the focused distance to the
centra index mark. Next, select
and aperture and set it to the
central index mark, and look at
the corresponding figures on
the depth-of-field scale on both
sides of the central index mark.
This is the extent of the depth-
of-field that will
be obtained with the aperture
you are using.
For example, if the camera is
focused at 30 ft. (10m) at an
aperture of f/16, the range of
sharp focus will be
approximately from 15 ft. (5m)
to infinity.
Note:
The aperture scale of the
viewing lens does not interlock
with the taking lens, so in
actual photography, never
forget to set the aperture of the
taking lens.
The distance scale of the
viewing lens is provided to read
the depth-of-field, and has no
relation with actual focusing.
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