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It should be remembered that the plane of the film in Model
H 16 is 17.52 mm, and in Model H 8 12.29 mm, from the base of
the lens when the latter is screwed home in position.
plane is indicated by a line (1) engraved on the edge of the
case, at a height corresponding to the axis of the turret.
surethatthefocussed lens is in the taking position on the turret,
i.e. opposite the opening in the gate.
Instructions for the Use of the Critical Visual
Focusser:
A prism covering a large part of the subject is fitted inside
the camera opposite the upper lens opening of the turret.
The prism is protected from outside dust by a flat-headed
screw which can be removed when it is desired to use the
prismatic focussing
of the image, an eyepiece can be fixed on the viewfinder.
Center the subject through the viewfinder.
so that the lens it is wish-
ed to focus is in front
the prism.
Open out fully
the iris diaphragm of the
lens.
Focus by means of
the
focussing
the lens until the subject,
seen through the magnify-
ing glass, is quite sharp.
Rotate the turret
the lens thus focussed is
brought
into
position, being careful not
to disturb the setting.
the iris diaphragm to cor-
respond with the required
exposure and once again
check the centering through
the viewfinder.
20
device.
To facilitate the
of
mount
on
so that
the
taking
Set
Make
observation
Rotate the turret
Fig. 15
This
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