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than full output, the thyristor circuit (TH1 and TH2) stops the discharge of energy
from the strobe storage capacitor (C8). Instead of being dissipated, the energy
remains stored and is saved for the next strobe fire. Thus during the recharge
cycle, only the difference between the stored amount of energy and the full value
of the strobe storage capacitor must be generated.
To reduce the recharge time even further, the ProCam strobe incorporates another
feature called sneak charge. Actually occurring at the end of one exposure cycle
in preparation for the next exposure, the sneak charge utilizes the period between
shutter blade closure and the start of film processing. During this part of the cycle,
the strobe storage capacitor receives a small amount of energy. After film
processing, normal charging tops off the circuit with enough energy for the next
flash exposure.
Strobe Specifications
Table 1-1 lists and describes the ProCam specifications.
Table 1-1. ProCam specifications
Specification Description
Strobe range 1.5 to 18 feet (0.46 to 5.5m)
Charge Time Maximum of 8 seconds
Stored Energy 30 wattseconds
Light Output Maximum - 750 BCPS
Nominal - 600 BCPS
Minimum- 460 BCPS
Strobe Duration 1/666 to 1/20,000 sec.
Strobe Preferred Camera is erected; new film is loaded
Automatic Recharge and door closed; flash override switch is
- Charges or tops off turned off; S1 is partially pressed; film
when: frame is processed.
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