Why do Nikon SB flashes set to TTL automatically turn to TTL FP?

edited October 2016 in V6 II Problems
When using Cactus V6 II, I have noted that all my Nikon SB flashes, set to TTL before turning the Cactus V6 II receiver on, turn to TTL FP as soon as I take the first photo, and the ISO get changed to 50.

Is this a normal procedure? If it is not, how to avoid it?

Thanks for your advise.


  • Thanks for your question.

    ISO 50 is an artibury value we put it in.
    It's meaningless when you use it off-camera as it does not affect the power output.

    TTL FP, we set it so that it can be ready for high-speed sync /focal plane at any moment.

  • Antonio. Many thanks for your explanation.
  • Anytime!
    Just shout if you have any other questions.
    Thank you.
Sign In or Register to comment.