Quantum Qflash T4d Operating Instructions Manual page 33

flash meter reading will be increased by whatever bounce occurs from
nearby surfaces.
These factors will affect calibration and should be considered.
3. Turn Qflash on and change the manual power setting to 1/8.
4. Set the film speed on the flash and the flash meter to the same value.
5. Change the F number on the flash until the distance shown in the
display is 10 feet.
6. Fire Qflash. Push the Set G button four times. "+0" will appear in the
upper right corner of the display and begin to blink.
7. Use Up/Down J L buttons to adjust compensation until the f/number
in the display matches the f the f/number on the meter. The light output can
be increased or decreased by as much as 2 stops in 1/3 steps.
9.2 Auto mode Qflash
Compensation
This procedure will calibrate
Qflash to a reflected light flash
meter you use and trust. Note
that only reflected light measure-
ments are reliable for auto expo-
sure settings.
This is because auto mode flashes read reflected light from the scene and
subject. In order to compare those readings to a meter, the meter must
also be reading the same reflected light. The reflected light is affected by
the subject and background, and an incident light reading will not typically
provide the same reading (unless the subject is an 18% gray card).
1. Place the Qflash 10 feet from a blank wall. The wall should be larger
than the metering area of the meter, and preferably a wall of continuous
tone (blank wall).
2. Place flash meter next to Qflash, also facing the blank wall. Be sure to
set the flash meter for a reflected reading.
3. Turn Qflash on and change the f/ number to F8.0
4. Set the film speed on the flash and the flash meter to the same value.
5. Fire Qflash. Push the Set G button three times. "+0" will appear in the
upper right corner of the display and begin to blink .
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