benjaminm Posted February 3, 2010 Share Posted February 3, 2010 <p>My D700's built in flash suddenly began to fire flashes in commander mode. I think the built-in flash shouldn't fire any flashes in commander mode in combination with a SB-800 as remote unit. Am I wrong?<br>D700 settings: e3=commander mode, Built-in flash mode= --, Channel=1, group A=TTL, comp=0<br>SB-800 settings: remote, channel=1, group=A<br>Thanks in advance,<br>Benjamin</p> Link to comment Share on other sites More sharing options...
Matt Laur Posted February 3, 2010 Share Posted February 3, 2010 <p>The pop-up always has to flash, so that it can communicate with the slave(s). There will be a couple of metering pulses before the exposure, and a small flash <em>during</em> the exposure. In most cases, it won't matter, since it's not contributing meaningfully to the exposure when you have it set to '--'. But if you're shooting something highly reflective, you might see a specular reflection from the pop-up. It's also possible that you'll get some subject blinking from the pop-up's pre-exposure activity, if they have good reflexes (I see it more in dogs, than people!).<br /><br />One solution: the under-$15 Nikon SG-3IR, which blocks all but the infrared emitted by the pop-up. Otherwise, it's an SU-800 in the hot shoe. Or radio triggers.</p> Link to comment Share on other sites More sharing options...
benjaminm Posted February 3, 2010 Author Share Posted February 3, 2010 <p>Matt,<br> yes, the flash light in '--' mode really differs from the flash light in TTL mode. But as you said, for serious use I'll have to buy an SU-800 unit.<br> Thanks,<br> Benjamin</p> Link to comment Share on other sites More sharing options...
ilkka_nissila Posted February 3, 2010 Share Posted February 3, 2010 <p>The pop-up emits mostly visible light both for flash and to communicate. Use the SU-800 if you want a more discrete i-TTL remote system.</p> Link to comment Share on other sites More sharing options...
pge Posted February 4, 2010 Share Posted February 4, 2010 <p>You can always just turn the onboard flash way down to the point where it doesn't effect your exposure much, you will still see it in the eyes but the sb-800 will be much larger, assuming you are taking photos of something with eyes.</p> Link to comment Share on other sites More sharing options...
tom_luongo1 Posted February 6, 2010 Share Posted February 6, 2010 <p>Built-in flash mode= -- and a shutter speed of 1/320 in FP mode. The built-in commander will send the sync pulse before the first curtain opens and won't appear as highlights anywhere.</p> <p>Instead of firing the remotes once when the shutter is fully open, FP mode works by rapidly strobing as the shutter curtain slit moves across the sensor. So the only way the commander flash can send an appropriate sync pulse is to do it before any of the sensor is exposed.</p> <p>It's simple to test this by triggering a remote while pointing the camera at a mirror. Shutter speeds 1/250 and below will show the commander flash going off. Shutter speeds above 1/320 won't show the commander flash. You can see some shots I did to demo this at the following posting - <a href="../nikon-camera-forum/00NjiR">http://www.photo.net/nikon-camera-forum/00NjiR</a></p> <p>But as previously mentioned, the SG-3IR and SU-800 are better solutions.</p> Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now