CONDITION CONDITION

11. The camera determines whether the subject is NEAR or FAR by measuring the amount of light reflected back to the photocell 2 milliseconds after the flash has fired (76 ms into the exposure sequence). If the measurement is more than 50% of the total needed for a proper exposure, the camera decides the subject is NEAR. If the subject is NEAR, the electronics sets the clock to time-out at 124 ms.

12. In a low-light NEAR picture, the blades open partially so that the photocell is measuring infrared light through the infrared filter. The flash is quenched and the shutter blades closed either when the photocell sees 100% of the light needed for a proper exposure or when the internal clock reaches 124 ms.

13. After the blades close, the motor is turned on. The timing gear advances the pick, indexes the counter, and brings the S5 actuator back to its original position. The shutter system is latched closed, ending the low ambient NEAR sequence.

NEAR FAR

CONDITION CONDITION

14. If the light measured 2 milliseconds after the flash has fired is less than 50% of the total needed for a proper exposure, the camera decides the subject is FAR.

15. In a low-light FAR picture, the blades open fully and the photocell sees scene light

through the photopic filter. When 100% of the necessary light is seen or when the internal clock reaches 396 ms, the flash is quenched and the shutter blades close.

16. After the blades close, the motor is turned on. The timing gear advances the pick, indexes the counter, and brings the S5 actuator back to its original position. The shutter system is latched closed, ending the low-ambient FAR sequence.