Rollei Mark II Manual De Instrucciones página 31

Functions
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Briefly press the control dial until the flash output is highlighted . To change
0 .1 f each, turn the control dial . For large adjustments, press and hold the
control dial for about 2 seconds . Turn the control dial to adjust the flash
output in 1 f increments .
TTL: In the TTL automatic mode the power can be adjusted from -3 .0 ~ +
3 .0 . The minium exposure compensation value is -3 .0 while the maximum
value is +3 .0 . The values can be changed in increments of 0 .3 .
2. Group A / B / C: In the same channel up to 3 groups (A/B/C) can be
controlled independently . Within each group the number of flashes is not
limeted . By pressing the group button repeatedly you can select the group of
which you would like to change the mode or power value .
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