Olympus E-3 User Manual page 52

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1.2

0.8

0.6

0.4

0.2

Now, to understand the next component we need to remember

that a focal plane shutter (as fitted to a D-SLR) consists of two

curtains. The shutter-speed set for any given exposure denotes

the delay between the departure of the first curtain to uncover

the sensor to the incoming light, and the departure of the second

curtain to blank it off again.

At speeds up to and including the X-synchronisation speed, the

gap between the first and second curtain exactly equals the

height of the sensor's imaging area. Thus, if we were to emit a

short burst of light at the moment that the first curtain

completely uncovers the sensor, the entire sensor area would be

able to record the flash light being reflected off the subject.

FP FLASH MODE EXPLAINED

At speeds beyond the X-synchronisation threshold, however, the

first curtain has only completed a portion of its travel before the

next curtain starts closing off the sensor. Thus if we were to

pulse the flash at any of these speeds we would only find a

Electronic Flash Emission

Time (ms)

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