Problems Syncing Pentax AF-540FGZ II and K-3

edited December 2016 in V6 II Problems
Yesterday I tried to sync a friends Pentax AF-540FGZ II to his Pentax K-3 camera using two Cactus V6IIs one as a trigger and the other as a receiver.  Following the instructions and set camera to Pentax and flash to AF-540FGZ II on the transmitter and AF-540FGZ II on reciver.  The flash fired but would not sync with the camera both in the NORMAL HSS mode of standard X mode (1/180 of a second).  What am I missing?


  • For Pentax, you need the V6II version, not the V6IIs version (which is for Sony only).
  • The "s" was for pural V6ii not for the Sony version. 
  • You are posting in the "Cactus IIs for Sony" forum. :)

    Have you made sure that all delay settings are "0" (off)?

    Perhaps try a factory reset of all triggers.

    Set the camera system to "Pentax" on the transmitter. You don't need to change the flash system on the transmitter (that's just for an on-transmitter flash).

    Set the flash system to "Pentax" on the receiver and manually select the "AF540F2" flash profile. Turn on the flash first, ensure that it is in TTL mode (or P-TTL) mode and then turn on the V6II receiver. The flash should be configured as if you were using it on the camera, not as a wireless slave (or similar).

    The above should work, but I can't say for sure whether it does because I don't have an AF 540 FGZ II. It works for me and my Metz 58 AF-2 and my three Pentax cameras (no K-3 among them, though).

    BTW, make sure your triggers are running at least V1.1.005.
  • Moved the discussion to the right place now.
    Thanks Class A.

    Keep us posted on your findings, @dlafferty2.

    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", "NIK.A.001", "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) but not by X-TTL firmware versions:  PEN.A.001 NIK.A.001 OLY.A.001.  No schedule has been released yet for an "A" version firmware on the V6 (MK1). 

    Cactus RF60X / RF60 Firmware versions A04 and A03 currently ONLY works with PEN.A.001 NIK.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.

    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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