If your camera was supplied with Eye-Level Focus already
fitted, only operations E to H need be undertaken.
A Remove the trifocal viewfinder from the clamps at the top of the camera,
and place it in the lateral position (on lid of camera).
B Unscrew the eyepiece lens of the critical visual focusser, which contains
the magnifier, and which is situated in the upper front part of the camera,
and replace it by the special magnifier lens supplied with the Eye-Level
Focus.
C Unscrew the clamps which held the trifocal viewfinder in the upper position,
and replace them by the special mountings supplied with the Eye-Level
Focus.
D Slide the Eye-Level Focus well home onto the new mountings, so that the
window in the front part of the instrument covers the special magnifier lens.
E Unscrew the flat-headed screw which protects the focussing prism on the
camera, as is done for normal use of the critical visual focusser.
F Without placing an objective in front of the prism, adjust the Eye-Level
Focus to suit individual eyesight by turning the small milled knob forwards
or backwards until the grain of the ground-glass surface of the prism is seen
in sharp focus when the camera is pointed towards the light. This adjust-
ment remains valid whatever the lens in use. It needs Only be altered if the
operator's eyesight changes.
G The instrument is now ready for use. Place the taking lens in front of the
prism, and bring the subject into sharp focus by rotating the focussing ring
on the lens. Take care to open the diaphragm fully, so that the brightest
possible image of the subject is obtained.
H Before filming do not forget to return the taking lens in front of the opening
in the gate, and to set the diaphragm according to the amount of light
available and the filming speed in frames per s
If the image observed through the Eye-Level
Focus appears off center or incomplete, pro-
ceed as follows :
a) remove the metal cap A, which is retained
by two small screws ;
b) adjustments can now be effected in the
vertical sense by slightly turning the small
screw B, and in the horizontal sense by
turning the two screws C, in the directions
shown in the sketch at right.
28
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