I had forgotten about that, and do have an SB-700. Good idea.
I forgot where I put my SB-700 but if memory serves me which it sometimes does the way to get the SB-700 to give the red AF assist pattern without firing the flash or even a preflash is to...
1) set the flash to master mode
2) set the master (channel M) to "---" or off
...now the important part...
3) set channels A and B to "---" or off also.
The SB-700 will now send a preflash for every channel that is turned on and since NO channel is on the SB-700 won't send any preflash
![Smiley :)](https://nikongear.net/revival/Smileys/default/smiley.gif)
but it will still give the red AF assist light pattern (provided all the other requirements are met which I guess varies from camera to camera).
I would setup the SB-700 and your camera in garden variety [TTL][BL] and once the AF assist pattern is being projected then proceed to the speedlight to master mode with all channels off. I think one used to need to setup the camera's focus mode to AF-S. That may still be true. One also used to need to use only the center focus spot. I'd start there but I do not think that is still true. Why else would the SB-700 have a "wide area AF-assist illuminator?"
The SB-700 and SB-800 are almost the same size and weight and the SB-800 has a simple menu option for AF-assist only. The SB-800 also has a wide area AF-assist. I'm really rambling.
![Smiley :)](https://nikongear.net/revival/Smileys/default/smiley.gif)
The steps above are a work-around since the SB-700 doesn't have that simple menu option.
I'm sorry I can't find my SB-700 tonight. I think I got this right.
![Smiley :)](https://nikongear.net/revival/Smileys/default/smiley.gif)
Best,
Dave Hartman
I find it best practice when using CLS/AWL to set any channel where there will be no remote to receive a preflash to turn that channel to "---" or off to save battery, cut lag time and reduce blinking.