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This feature is used to lock flash output, allowing photographs to
be recomposed without changing the flash level and ensuring
that flash output is appropriate to the subject even when the
subject is not positioned in the center of the frame. Flash output
is adjusted automatically for any changes in ISO sensitivity and
aperture. FV lock is available with CLS compatible flash units
only (0 288).
To use FV lock:
1 Assign FV lock to a camera control.
Assign FV lock to a control using
Custom Setting f1 (Custom control
assignment, 0 268).
2 Attach a CLS-compatible flash unit.
Mount a CLS-compatible flash unit (0 288) on the camera
accessory shoe.
3 Set the flash unit to the appropriate mode.
Turn the flash unit on and set the flash mode to TTL, monitor
pre-flash qA, or monitor pre-flash A. See the documentation
provided with the flash unit for details.
4 Focus.
Position the subject in the
center of the frame and
press the shutter-release
button halfway to focus.
FV Lock
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