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", "NIK.A.001", "v.103", or "A06".

    TTL or HSS not working on Cactus V6 II and V6 IIs? Be sure to check hot shoe connectivity by doing the <CAMERA INFO> check.

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