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| p.1 #3 · can you set ttl-fp on Nikon SB 910 off-camera? |
...wondering if I can do it off-camera using my Alienbee transmitter and receivers?
As you found, no, the AB CyberSyncs can't do it; it requires a Nikon-dedicated system like the Pocket Wizard ControlTL units or (I think) the new Yongnuo YN-622N.
...Can I use the SB900 as a commander to fire the SB910 remotely in TTL-FP?
Yes, or an SU-800 Commander. Because that method is optically-based rather than radio-based, you'll have the usual line-of-site and bright ambient issues, but it many situations it works well.