Yes, I'm aware that even when the pop-up flash is technically turned off, it still puts out a small flash to alert the remote. However, I doubt that is enough to make it pause out, otherwise, others would be complaining about this (especially wedding photographers).
I may not have mentioned it in my original post, but this problem only occurs when the SB-900 is used as a remote. On-camera there isn't an issue. So, that might be an indicattion this is related to the pop-up.
I've swapped out camera cards because the buffer filling up was my first thought, but that made no difference. Fast or slow processing speed, big or small storage capacity, the problem remains the same.
I've not counted the shutter clicks or flashes before the pausing kicks in or the duration of the pauses but will see if there is some consistency. I'll also test to see if it varies between RAW and JPEG shooting.
As for your other questions, I'll do some testing this weekend to see if the problem can be duplicated on another camera and with another flash (I have an SB-700, too) on the D700.
>Michael: > >With the popup set to OFF (---) in commander mode, it still >fires: > >1) During the shutter closed preflash sequence that is used to >establish power levels for the remote unit(s). > >2) A low power pulse while the shutter is open, signaling the >remote unit(s) to fire for image capture. > >How long does it take for the ready light to come on in the >remote speedlight when the slowdown begins? > >How long is the pause when the slowdown begins before it >resumes operation? > >From a cold startup, how many shots can you fire before the >slowdown occurs, and over what time interval? > >Is it possibly a buffer full issue in the camera? What is the >capacity of the storage card you are using, and what is its >speed? > >Can you test the remote speedlight on another camera? If it >works there, this suggests a camera problem of some type. > >Can you test another speedlight on your camera? If this >works, it suggest a speedlight problem of some type. > >Let me know what additional testing reveals. > >Regards, > >HBB in Phoenix, Arizona >Nikonian Team Member > > Photography is >a journey with no conceivable destination.