I have the 7100 and a sb600. I was hoping I could use the commander mode on the 7100, turn off the built in flash and not trigger it when using the 600 in wireless remote. But it doesn't seem to work with the 600. Have any of you tried to do what I described?
#1. "RE: 7100 + commander mode + sb600?" In response to Reply # 0 Sun 14-Jul-13 02:39 PM by km6xz
St Petersburg, RU
Using a SB600 in TTL remote wireless mode requires light pulse communications between the remote flash and the camera. That is done by the popup-flash set to Commander Mode, another CLS wireless compatible shoe mounted flash, such as another SB600, a SB700 or a SB900. It can also be accomplished by using a Nikon SU-800 IR optical commander mounted one the camera hot shoe.
When the popup flash is used as commander, you can set it to contribute to the exposure or to not add light to the exposure, even though the flash is firing, the exchange of communication pulses occur before the shutter opens. If you are close to the subject, they can be a little light contribution to the exposure however. At about 7-8 feet or more, the low power communications pulses will not contribute to the exposure unless you set the mode to Commander/TTL and some flash compensation value.
The Nikon Creative Lighting System uses a sequence of command and response light pulses immediately before the shutter is opened to poll the remote flashes and send back coded commands for power settings, based on the meter results of light falling on the subject when each remote is told to fire a reference flash. It is a complex system that works really well and with little input from the user. So, the popup flash is needed if you are not using another model as commander. You can trigger remote flashes as dumb slaves in SU-4 Mode but that is full manual in power settings. That is more practical for controlled studio environments. You can also use radio triggers, but also manual in settings, however there are a few expensive RF triggers which work with CLS.
If you only need one remote flash, and have it in close proximity to the camera, a cable that attaches to the hot shoe and connects to the SB600 can be used in full TTL mode. Nikon has the SC-28 and SC-29 model cable assemblies for that purpose. What are you trying to accomplish and under what conditions? Stan St Petersburg Russia
#2. "RE: 7100 + commander mode + sb600?" In response to Reply # 1
Hey Stan, thanks for explanation. When I saw it flash I just assumed it was full power. I'm just trying to prepare to take some engagement photos of my oldest son and his fiancée. Off camera flash is certainly going to produce better results. My plan is to do these outdoors in open shade.
#4. "RE: 7100 + commander mode + sb600?" In response to Reply # 2
St Petersburg, RU
If you are using it outdoors be sure to point the flash body's front, where the light sensor is, towards your camera so it sees the command flashes. You can rotate and tilt the flash head towards you subjects. If there is fill light needed while the SB600 is sharing duty as main light sources, you can still get some fill flash to brighten eye sockets etc by putting the popup flash in Commander mode, TTL and set some level of popup flash contribution. If there is primary light coming from the external flash and diffused sky light try -1ev as a experiment starting level if you need more fill with the popup flash from the camera's perspective. If there is backlighting, you are going to need all the light you can get to fill darker faces so use both the SB600 and built-in flash to balance the backlight. Stan St Petersburg Russia
#5. "RE: 7100 + commander mode + sb600?" In response to Reply # 4
Stan, good point about turning the flash body toward my camera and the pop up. I would not have thought about that? This off camera flash stuff is complicated. All good advice. I'll let you know how it goes.
#6. "RE: 7100 + commander mode + sb600?" In response to Reply # 4
>If you are using it outdoors be sure to point the flash >body's front, where the light sensor is, towards your camera >so it sees the command flashes. You can rotate and tilt the >flash head towards you subjects. FYI - on SB-600 the sensor for wireless flash is on the same side as the battery cover. The big red window on the front is for the AF assist.
+1 on testing outdoors before the event. You will definitely want to test wireless range. You may wish to assign some custom flash settings to My Menu as well as to Fn button and/or DOF Preview button. FV Lock is one option I like to have assigned to a button when using flash. Also consider a Stofen or similar diffuser to attach to the SB-600.