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Film Speed Switch
To compensate for minor differences in film speed from one pack to another, a
Film Speed Switch is incorporated in the ProCam. This Switch is located in the
film compartment of the ProCam and is actuated by a plastic tab (rail) on the side
of the film pack (Figure 1-17).
Figure 1-17. Film Speed Switch
When a pack of “normal” film is inserted into the ProCam, a tab on the pack
opens the Switch. This tab is not present on “slow” film packs. Therefore, when
a pack of “slow” film is inserted, the Switch stays closed. With the Switch closed,
the calibrated strobe and ambient exposures are increased by 0.33 +/- 0.15 stop to
compensate for the slower film.
Camera Inhibits
The ProCam electronic circuits are designed to prevent certain types of ProCam
operation while another function is taking place. These inhibits are:
• Strobe fire is inhibited during dark slide.
• ProCam cycling is inhibited during strobe charge.
• The strobe converter is inhibited during the ranging and processing cycles.
FILM SPEED
SWITCH
TAB (RAIL) ON
NORMAL SPEED
FILM PACK
FILM PACK
PROCAM
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