Specifications

FEC NOTE: Flash Exposure Compensation (FEC) can be set in many places and all values are added together.
FEC can be set:
• On the Power Dials of the AC3 ZoneController
• On the camera for all zones except AC3 Manual zones
• For transmitting radios, the PocketWizard Utility can adjust the PowerTracking center point for ISO and
aperture which affects all zones
• For the PowerST4, the PocketWizard Utility can adjust FEC for the connected ash on the Exposure Tab
If the combined FEC settings are more or less than your ash’s capabilities, then the ash will operate at maximum
or minimum output accordingly.
CAMERA FEC RANGE: The center point for PowerTracking is 3 stops down from your ash’s maximum, so normally
+3 on your camera’s FEC would equal ash maximum power. If your camera has a maximum FEC of +2 stops, and
you want that setting to equal your ash’s maximum output, set Flash Exposure Compensation in your PowerST4
to +1.0. When you have made this setting, Zero (0) on your camera’s FEC will now be 2 stops down from ash
max instead of 3. If your camera’s highest FEC is +1, set this control to +2.0. You can use this control to align your
camera’s lowest FEC setting with your ash’s minimum power similarly.
See the Exposure Tab - Flash Exposure Compensation section below for more information.