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Additional information
Color Temperature
The color temperature of D4 Air is calibrated to neutral daylight. Thanks to Profoto's
"Hybrid Flash T echnology" the color temperature remains perfectly constant and reliable
from flash to flash over the entire power range, regardless of the selected energy levels
and the number of flash heads used. This makes the D4 Air generators perfectly suited
for all kinds of critical assignments, even with high-resolution digital cameras and backs.
In combination with all actual Profoto flash heads and light shaping tools, the D4 Air
generator gives neutral and extremely stable color. Please note that other factors, like
reflections from the surrounding and lenses with different color characteristic, may also
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affect the color of the picture.
Combining flash tubes and/or glass covers with different coatings can make distinctive
color temperature adjustments if needed.
f-stop stability
Profoto's " Hybrid Flash T echnology" offers constant power output from flash to flash. T his
ensures stable and repeatable results, which is essential when D4 Air generators are used
in combination with Multi Shot backs or for 3D pictures. The power stability of the D4 Air
generators is in fact better than the repeat accuracy of most flash meters.
Flash duration
The flash duration can be shortened by reducing the power output. The shortest flash
duration using an Acute/D4 head and a D4 1200 Air generator at lowest energy is 1/7500
s. To shorten the flash duration even more at a given light setting, use an Acute/D4 Twin.
For example, if you connect the two plugs of an Acute/D4 Twin to the Lamp Head Sockets A
and B [9] of a D4 1200 Air generator and select 600 Ws on both outlets, the flash duration
will be just 1/2600 s instead of 1/1000s at maximum power with an Acute/D4 head.
Petrol-electric generators
All petrol-electric generators can produce voltage peaks that may damage electronic
devices. If a D4 Air generator is powered with a petrol-electric generator distributing
190-240V, a separate Profoto ProGas2 device (protecting against dangerous high voltage)
must be used for each connected generator. To power one D4 Air generators, a 3000 W
petrol-electric generator is recommended; for two D4 Air generators, a 6000 W petrol-
electric generator, etc.
NOTE:
Voltage peaks of petrol-electric generators can shorten the lifetime of the modeling lamps. Because of that it is
recommended to use the modeling light in the ½ PROP mode.
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