17. After the flash is charged and the exposure button is pressed all the way in, three things
happen simultaneously which decide how the flash is going to be controlled:
1 - The solenoid releases the shutter blades and they start to open;
2 - The photocell starts to measure scene light;
3 - An internal clock in the camera logic is started.
18. From this point, there is a race between the internal clock and the photocell to decide which
is going to control the flash. Either the internal clock will time-out before the photocell
measures a pre-determined amount of light or vice versa. Whichever occurs first will fire the
flash.
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