52
Magnesium Powder Flash Emission
0
0.2
0.4
0.6
0.8
1
1.2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Time (ms)
Output level (%x100)
portion of the frame exposed by flash illumination and the
balance of the frame by ambient light.
The FP (full synchro) flash operates like most other flash units at
speeds up to the X-synchronisation setting but it then turns back
the clock to the early days of photography and behaves like the
flash illuminators one often sees in period comedies where
magnesium powder is set in a tray and ignited by a spark.
Usually the comedies then show the poor photographer with a
blackened face and singed hair!
Luckily, the modern equivalents do not pose any danger to the
operators. What made the old
FlitsligtPulver (flash light powder)
units special is that their light/time emission graph looked
something like the following example:
You will notice that the FP system reaches peak illumination a bit
slower than an electronic flash unit, however, it stays at this peak
level for some time before gradually fading away.
In essence, therefore, there is a bright light for a longer period.
Now, if the period for which the bright illumination co-incided
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