Kowa SIX Version II - Focusing the Camera; Focusing for Infra-red Photography; Using the Depth of Field Scale

3Xlt is advisable to use small apertures in infra-red photography. In most
circumstances, the added depth-of-field will compensate for possible
focusing error. Depth-of-fied increases as the lens is stopped down
(aperture selection ring moved to higher numbered f/stops).
4. Focusing
Turn the focusing ring until the image on the viewing
screen
appears
sharp.
With
all
viewing
screens
(unless
instructions
for
a
specific
screen
state
otherwise).
critical
locusing
should
be
done
with
the
center
spot.
For less critical focusing. the distance may be estimated
and set on the distance scale. To measure film to sub-
ject
distance
lapplicable
is
some
close-up
applications)
measure from the Ф mark on the camera. This mark in-
dicates the film plane.
5. Focusing for infra-red photo-
graphy
It is always necessary to compensate for the different
wavelength sensitivity of infra-red film. To do this. focus
as usual. Then move the distance indication which has
aligned with the index mark to the red line on the depth-
of-field scale (as shown in the above picture). Generally,
an R2 or O2 filter is used for infra-red work.
6. Depth of Field Scale
As this is a single-lens reflex camera, the range of
sharp focus may be ascertainted on the viewing
screen with the help of the depth-of-field preview
lever. For an approximate check, use the depth-of
field scale on the lens barrel. The picture shows
depth-of-field at F/16, 3 meters (10 feet 2 inch)