I have upgraded from a D5000/SB400 to a D800/SB910. I have read the SB910 manual (many parts multiple times), but I have a few questions about wireless operation.
- When the flash is set to remote, and the camera to Commander, the camera preflashes and takes a picture like I would expect. However, I was trying to compare shots using the popup...I set the camera to TTL, but the SB910 still fired. The camera emitted no preflash and the SB910 appeared to fire a brighter flash than when in commander mode. I had thought that the SB910 would be disabled if the camera was on TTL. Does the SB910 simply signal off any "bright" light? Could I put the SB910 on remote and fire a P&S and have it fire (if the P&S flash fired)? How is the flash determining zoom, output, etc in this situation?
- It appears the popup flash is contributing to the exposure instead of just directing the SB910 when in Commander mode. I tested this by positioning the SB910 in an area that I assumed would create some shadow on the subject, yet the subject was illuminated as if the popup contributed. If this is the case, how do you disable the popup contributing to the final shot?
- When only the SB910 + camera is used (using the pop-up to command), it seems I can only use the SU-4 type wireless (instead of the "Advanced Wireless Lighting")? By the naming ("Advanced") I'd assume I'm giving something up by using SU-4 mode? The manual describes how to use each mode, but doesn't appear to give any guidance on when you would choose one over the other.