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First Light Detect
The first light detect takes place 25 +/- 3ms after Solenoid 1 is released. An
opening in the shutter blades allows light from the encoder LED to reach the
phototransistor of the encoder pair (Figure 1-14). This action gives the encoder
circuitry one count and acts as a starting point for exposure time-outs as
mentioned above.
Figure 1-14. First Light Detect
Dual Photodiode
Light integration in the ProCam is determined by measurements taken through a
dual photodiode (Figure 1-15).
Figure 1-15. Dual Photodiode
DUAL
PHOTODIODE
TOP
(GREEN FOR
VISIBLE LIGHT)
BOTTOM
(BLACK FOR
IR LIGHT)
DUAL PHOTODIODE
FILTER
OPENING HERE AS SHUTTER
BLADES STAR TO OPEN
ENCODER
LED
ENCODER
CIRCUIT
ENCODER
PHOTDIODE
QUINTIC LENS IN
FOCUSED POSITION
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