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p.2 #8 · understanding flash duration? | |
RMS956 wrote:
Ryan Pream wrote:
So the D1 get's longer flash durations as the power lowers where are the Einstein get's shorter. I know the D1 is supposed to have very good color accuracy, so I guess this is some additional circuitry compared with a standard flash?
Ryan
Yes I believe the Einstein has two modes of operation:
1. Normal flash with highly accurate and consistant color.
2. Action flash using the IGBT circuit with no accurate color.
Don't think you can have both in a studio type flash.
RMS
Both Einstein modes use the IGBT circuitry, and both shorten the flash duration dramatically as you lower power. The difference is, in Color Mode the shortening of durations is not quite as dramatic and occurs a bit more gradually, but the color remains constant, within +/- 50°K. In Action Mode the duration shortening is more rapid and dramatic but the color temperature rises as you reduce power.
Most users will use Color Mode most or all the time, reserving Action Mode for shots that demand the very fastest action stopping at the cost of some color shift. In color Mode, the t.1 duration is about 1/1700 at 1/2 power and falls to about 1/6000 t.1 at 1/128 power. In action Mode t.1 is about 1/2000 at 1/2 power and falls to below 1/10,000 at 1:128 Power.
Since the D1 is not IGBT controlled I would expect it's color to warm by about 80° per halving of power as essentially all units that use other voltage controlled power control.
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