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Operating Instructions—C-30B Camera
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USING THE POLAROID
PACK FILM BACK
Focusing
The following procedure describes how to focus the
camera using the focus plate w ith a Pack-Film back.
1. Obtain a properly-adjusted trace on the crt.
2. Open the camera back by releasing the door latch and
insert the focus plate where the pack film would
normally be placed as shown in Figure 2-4(A).
3. Orient the frosted side o f the focus plate towards the
crt, inserting the left side under the door hinge and
down next to the exposure window. The haif-circle
cutout in the plate provides a finger hole for easy
removal of the focus plate.
4. Set the aperture for maximum opening (f/1 .9) and set
the SPEED selector to T. With the shutter open, you
should observe the display on the biprism of the
focus plate.
NOTE
Either the c rt horizontal trace o r the internal
graticule line may be used to ad just focus.
5. Release the FOCUS LOCK knob and adjust the
FOCUS knob until the trace (or graticule line) is
aligned w ith itself. Refer to Figure 2-4(B) fo r an
example o f an in-focus display.
BIPRISM
FOCUS
HALF-CIRCLE
SPOT
PLATE
CUTO UT
A .F O C U S PLATE IN STA LLED
ON PACK F IL M CAM ERA BACK.
O U T OF-FOCUS
DISPLAY
IN-FOCUS
DISPLAY
B. CENTER OF SPLIT IMAGE
FOCUS PLATE
2 8 2 5 -0 6
Figure 2-4. Installing and using the focus plate in the pack-film back.
6. Tighten the FOCUS LOCK knob to ensure that the
focus setting cannot be changed accidentially.
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Summary of Contents for C-30B
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