SB700 using TTL passthru acts like it went off but didn't

I have a D750  with a V6 on it, then the SB700 on that.
Passthrough enabled.
Take a photo, and the SB700 acts like it went off (the red flash light starts flashing like it's recharging), but no flash happens.
When flash directly on the camera, works fine.

Thanks in advance!


  • Hello JuniorJr, the problem lies with the Nikon D750.

    See this thread:

    Nikon has made the hot shoe slightly different than its siblings and the V6 may not work as hot shoe pins do not all line up.  We will have a new hot shoe specifically made to cure this and it will be available in the next couple of months.

    Please wait for updates in the other thread or feel free to email us directly too:

    Thank you.
    Antonio Lao
    Brand Manager

    To help us better help you, always state the exact firmware version installed on your Cactus device(s), such as: "1.1.013", "FUJ.1.002", "v.103".

    For the time being, Cactus V6 (MK1) running on firmware version 2.1.001 can be triggered by a V6 II (MK2) running on Multi-brand HSS firmware (e.g. 1.1.013) and not by X-TTL firmware versions: PEN.A.001 and OLY.A.001.  No schedule has been released yet. 

    Cactus RF60X / RF60 Firmware versions A01 and A02 currently ONLY works with PEN.A.001 and OLY.A.001.  Other "A" version of X-TTL firmware will be released soon. For both Multi-brand HSS and X-TTL firmware versions (FUJ, SIG, SON), install firmware version 103 / 205 on your RF60X / RF60.

    Cactus RF60 is now an off-camera TTL flash with firmware version 205 or later!

    Metz M400 (for Fujifilm) is now supported on the Cactus V6 II (HSS and TTL).

    Nikon D750 users please read this thread: 

    Fujifilm EF-X500 users please read this thread:

    Feel free to suggest an improvement or share product ideas. Contact us directly at  At Cactus, we listen. 
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