18
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, it can be seen from
the depth of field scale that the zone will extend from 2 to 7 meters (6 ft. to 23 ft.), when a
lens opening of F/22 is used.
* See the depth of field table for the Zenzanon-S 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 no longer in wavelengths than the visible rays used for focus-
ing. 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.
B. The lens shutter of the Zenzanon-S lens has a X-setting for flash
synchronization, which means that electronic flash units will synchro-
nize at all shutter speed settings, up to the fastest 1/500 second. This
means that flash fill-in for daylight shots can also be made very easily.
19. Distance Scale and Depth of Field Scale (con’t)
20. Infrared Photography
21. Flash Photography
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