Hi everyone!
I use a Pentax K3 and my V6II indicates me that the TTL system does not match.
I would appreciate  any solution for this problem .
Thanks in advance.


  • You probably do not have an on-camera flash mounted on the V6 II (TX)? 

    When you hold down the Menu button on the V6 II (PEN.A.001), it tries to switch the on-camera flash mode between manual control and TTL. 

    What are you trying to do?

    if you are trying to change operating mode of your off-camera flash, press the group buttons on the V6 II. 

    In the meantime please be sure to refer to the Quick Start Guide:


    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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