How can I use a Godox TT350-N off-camera with rear-curtain sync on a Nikon D610 without firing the built-in flash?
Asked 7/16/2020
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I want to shoot a long exposure on a Nikon D610 and have an off-camera Godox TT350-N fire only at the end of the exposure using rear-curtain sync. I do not want the camera’s built-in flash to contribute to the exposure. I tried using the D610’s Commander Mode and matching channel/group settings on the flash, but it isn’t working. Is there a way to do this with the built-in flash disabled, or do I need different settings or equipment?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
5y ago
2 Answers
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Commander mode is for Nikon's optical CLS system or their radio WR system. It does not work with Godox's 2.4 GHz radio system. While the Godox TT685-N and V860 II-N full-sized speedlights can be optical CLS commanders/slaves, the TT350-N/V350-N cannot.
Your TT350-N is set into radio master mode [antenna icon in lower left with M], to be used as a transmitter on your camera's hotshoe. To get it to work as a radio slave, you also need a Godox transmitter for the camera hotshoe (e.g., XPro-N, X2T-N, Flashpoint R2 Pro II-N). The transmitter should let you set 2nd curtain; instead of using the camera menus to set wireless control, you'd use the transmitter's UI instead.
If you do get a Godox transmitter, you would need to set the TT350-N to radio slave mode by holding down the SYNC button, and when the radio icon flashes, use the wheel/SET button to cycle through M/S/off.
You can trip the TT350 off-camera with your pop-up flash (out of Commander mode, and in M/TTL) by using the S1/S2 "dumb" optical slave modes (be in M mode, no radio function set, and use the SLAVE button on the TT350), but these are similar to SU-4 mode, and do not allow for TTL/HSS communication, and possibly do not allow 2nd curtain (depends on when the pop-up flash burst fires). You may also need to take the TT350 out of radio slave mode for this.
See also: My Godox flash won't fire off-camera. What should I check?
Originally by user27440. Source · Licensed CC BY-SA 4.0
user27440
5y ago
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You can’t do this with the D610’s built-in Commander mode and a TT350-N alone.
Why: Nikon Commander mode is for Nikon’s optical CLS/AWL system, while the Godox TT350-N uses Godox’s 2.4 GHz radio system. The TT350-N is not a Nikon CLS remote slave, so matching the camera’s Commander settings won’t make it fire that way.
Also, if you use optical triggering from the built-in flash, the built-in flash must emit a trigger pulse. So it cannot be truly “off.” At best, you can block its visible light with an IR filter such as Nikon’s SG-3IR, but it still has to fire to trigger an optical slave.
The practical solution is to use a Godox-compatible Nikon hot-shoe radio transmitter on the camera, such as an XPro-N or X2T-N, and set the TT350-N to radio slave mode. Then use the transmitter—not the camera’s Commander menu—to control the flash and enable rear-curtain sync.
So: for off-camera rear-curtain sync with no built-in flash contribution, you need a Godox radio trigger.
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