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Operating Instructions—C-30B Camera
USING THE POLAROID
ROLL-FILM BACK
Focusing
To focus the camera using the focus plate w ith a
Polaroid Roll-Film back, perform the following procedure:
1. Obtain a properly-adjusted trace on the crt.
2. Open the camera by swinging the latch lever out and
down from the top of the camera back as shown in
Figure 2-7.
3. Open the back fu lly and swing out the inner panel.
4. Orient the frosted side of the focus plate toward the
camera lens and insert the two bottom ears inside the
edge o f the camera-back film compartment. Gently
press the upper mounting ears all the way into the
film plane w ithin the film compartment. The upper
mounting ears must be compressed, and the focus
plate inserted into the film compartment at the same
time as shown in Figure 2-8(A). The half-circle cutout
in the plate provides a finger hole fo r easy removal of
the focus plate.
Figure 2-7. Opening the roll-film back.
5. Set the aperture fo r maximum opening (f/1 .9) and set
the SPEED selector to T. With the shutter open, you
should observe a display on the biprism of the focus
plate.
NOTE
Either the crt horizontal trace or the internal
graticule line may be used to ad ju st focus.
6. Release the FOCUS LOCK knob and adjust the
FOCUS knob until the trace (or graticule line) is
aligned with itself. Refer to Figure 2-8(B) fo r an
example o f an in-focus display.
7. Tighten the FOCUS LOCK knob to ensure that the
focus setting cannot be changed accidentally.
BIPRISM
FOCUS
HALF-CIRCLE
SPOT
PLATE
CUTO UT
A .F O C U S PLATE IN S T A L LE D ON
R O LL F IL M CAM ERA BACK.
DISPLAY
IN-FOCUS
DISPLAY
B. CENTER OF SPLIT IMAGE
FOCUS PLATE
2 8 2 5 -1 8
Figure 2-8. Installing and using the focus plate in the roll-film back.
2-8
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Summary of Contents for C-30B
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