Instruction manual

18
B. There is an apparent zone of sharpness, both in front and back of
the focused subject, which is known as the depth of field. The depth
of field scale shows the zone of apparent sharpness at any lens open-
ing or distance and can be utilized for quickly and simply ascertain-
ing the depth of field. The depth of field scale is next to the distance
scales and is made up of identical pairs of apertures on both sides of
the orange-colored distance index. These identical pairs of apertures
indicate the distance that will be in focus at these lens openings. For
example, if the 80mm lens is focused at a distance of 3m (10ft.) it can
be seen from the depth of field scale that the zone will extend from 2
to 7 meters (6ft. to 23ft.), when a lens opening of F22 is used.
* See the depth of field table for the Zenzanon-PS 80mm lens.
In infrared photography, some adjustment must be made in the focus
in order to retain sharpness on the film, because the invisible infrared
rays are longer in wavelength than the visible rays used for focusing.
For infrared photography:-
1. Use an R filter or equivalent with an infrared (black-and-white) film.
2. The red-colored line, next to the orange-colored distance index, is
the infrared index.
3. After focusing in the normal manner, re-set the distance indicated
by the orange-colored distance index to the infrared index, by shift-
ing the distance ring.
4. Follow instructions enclosed with the infrared film and filter, and to
be on the safe side, make several bracketing shots. In general, more
exposure rather than less seems to be a safe guide.
A. Always use flash cords with a standard PC type plug. When detach-
ing the flash cord, grip the plug firmly and pull it out straight, instead
of using a twisting action.
20. Distance Scale and Depth of Field Scale (con’t)
21. Infrared Photography
22. Flash Photography