CACTUS X-TTL – Update For V6 II / V6 IIs Announced



Cactus Image have announced the addition of TTL metering to their cross-brand V6 II and V6IIs radio transceiver system, through free firmware updates to be available soon on their new X-TTL microsite.

The unique V6II and V6 IIs transceivers previously provided HSS, Remote Power Control, and Remote Zoom Control, for Canon, Nikon, Fuji, Pentax, Olympus, Panasonic, Sigma, and Sony (with V6 IIs) flashes, all at the same time.

And with the new firmware they will support automatic TTL exposure as well, in the same cross-brand environment.

The updates are system specific, so you will need to choose the option to match your camera brand. Though a Sigma camera for example, will provide wireless TTL with Canon, Nikon, Olympus, Panasonic flashes. As well as flashes that run on the same camera system (Sigma in this example).


Cactus have also added something of what appears to be their own interpretation of the growing trend towards hybrid TTL, in the form of 2 TTL lock options –

1. Flash Compensate – Store a desired flash exposure that will automatically adjust according to changes in camera settings. Gone is the ever-changing flash exposures between each TTL metering.

2. Flash Power Lock – Lock flash power output after a desired TTL exposure is achieved. Perfect for consistency in repeat shooting.




The Cactus V6 II system is quite detailed so please see the full Press Release below –


TTL without Boundaries! Cactus launches FREE firmware upgrades on the V6 II and V6 IIs to support wireless cross-brand TTL.

Hong Kong, March Hong Kong, March24, 2017 – Just nine months since the release of the Cactus V6 II and Cactus V6 IIs, Cactus is now launching a series of brand-specific firmware upgrades to transform the cross-brand HSS flash triggers to one that also supports cross-brand wireless TTL.

The new X-TTL firmware versions, apart from supporting cross-brand high-speed sync (HSS/FP), remote power and zoom control of Canon, Fujifilm, Nikon, Olympus, Panasonic, Pentax and Sigma flashes all at the same time 1*, NOW support automatic TTL exposure in the same cross-brand environment, both exposure on-camera and off-camera.2*

The first wave of firmware releases will be for Sigma, Sony, and Fujifilm. Other camera systems, Canon, Nikon, Olympus, Panasonic and Pentax, will follow one by one as we complete system integration on the V6 II. All these X-TTL firmware versions are free of charge for V6 II / V6 IIs users. The new firmware is system-specific so users simply choose the corresponding system when updating with the Cactus Firmware Updater. Once installed, the V6 II / V6 IIs is transformed into a cross-brand wireless TTL flash trigger.

This unique function gives photographers an unprecedented flexibility. The need for matching flashes with the same camera system for on and off-camera TTL flash photography is over – TTL without boundaries.

Cross-brand TTL

The X-TTL firmware allows users to have wireless TTL automatic exposure with camera and flash that runs on the same system, such as a Canon camera triggering a Canon flash, and one that runs on different systems, such as a Sigma camera triggering a Nikon system flash. Similar to the cross-brand HSS firmware on the V6 II, the supported flash systems for wireless cross-brand TTL include Canon, Nikon, Olympus, Panasonic, and flash that runs on the same camera system.

Two unique Exposure Locks

Cactus is unveiling a brand new approach in using TTL metering. Over the past, professionals who love the convenience from TTL metering often have to suffer inconsistency in lighting outputs, making post processing a pain. In view of this Cactus devised two types of Exposure Locks.

1. Flash Compensate: Store a desired flash exposure that will automatically adjust according to changes in camera settings. Gone is the ever-changing flash exposures between each TTL metering.

2. Flash Power Lock: Lock flash power output after a desired TTL exposure is achieved. Perfect for consistency in repeat shooting.

Wireless TTL functions

The X-TTL firmware will also support advanced TTL functions on the Cactus V6 II and V6 IIs, such as first and second (rear) curtain sync, on-camera TTL, group TTL metering and TTL lighting ratios 3*.

New support for Sigma

We are delighted to offer firmware support for Sigma cameras and flashes. This includes remote power control, remote zoom control, wireless High-speed Sync, and wireless TTL with Sigma’s SA-TTL flashes. The same cross-brand support is also available on the Sigma X-TTL firmware.

Cactus expresses appreciation to SIGMA CORPORATION for their immense support in our development for Sigma system firmware.

Fujifilm TTL and HSS

With the introduction of Fujifilm new flash system launched on the EF-X500, Highspeed Sync (HSS/FP) is finally available. Besides adopting the new HSS platform, the upcoming Fujifilm X-TTL firmware also extends support for wireless TTL to Fujifilm flashes as well as Canon, Nikon, Olympus, and Panasonic flashes. Fujifilm X-TTL Firmware release date will be announced on our website.

V6 IIs with Sony TTL

Existing Sony V6 IIs users already has a system-specific transceiver unit, and the upcoming Sony X-TTL firmware adds wireless TTL support for Sony flashes and other system flashes when paired with the Cactus V6 II. Sony X-TTL Firmware release date will be announced on our website.

Features at a glance

1. Cross-brand wireless manual power and zoom control with HSS/FP support of Canon, Fujifilm, Nikon, Olympus, Panasonic, Pentax and Sony flashes; 2*

2. Cross-brand wireless TTL of Canon, Fujifilm, Nikon, Olympus, Panasonic, Pentax, Sigma and Sony flashes; 2*

3. Cross-brand group TTL metering is extended to use in a cross-brand setup; 3*

4. TTL Ratios output adjustments can be done directly TTL Ratios on the V6 II (TX); 3*

5. Two Exposure Locks offer consistency with the convenience of wireless TTL.

6. Works seamlessly with Cactus RF60X to support HSS, TTL, remote power and zoom control.

Price and Availability

System-specific X-TTL firmware versions are free of charge. Download the Cactus Firmware Updater4* and select the corresponding system firmware to install the X-TTL firmware on the Cactus V6 II and V6 IIs. After launching the initial three systems, i.e., Sigma, Fujifilm and Sony, Cactus will continue to launch X-TTL firmware for the remaining camera systems. Stay up to date for the latest releases on X-TTL’s microsite:

About Cactus

Headquarter in Hong Kong, Cactus designs and engineers professional wireless photographic lighting equipment – wireless flash triggers, wireless portable flash, laser trigger, and other lighting and camera accessories in our Hong Kong studio. Cactus is a global brand with distributors and dealers throughout the world.


1* With the exception of Pentax and Sony system flashes due to special timing requirements so they must be paired with a Pentax and Sony camera respectively in order to support HSS.

2* Only Canon, Nikon, Olympus and Panasonic system flashes support cross-brand TTL.

3* This function may not be supported on all the camera systems.

4* Cactus Firmware Updater version 3.01 or later will better facilitate firmware selection. To be released soon!”






X-TTL Firmware updates will be available from the Cactus X-TTL microsite.

The Cactus V6 II and V6 IIs transceivers are available now for $95.00 each –

Cactus V6 II – Adorama, B&H Photo, Amazon, UK, Ebay
Cactus V6 IIs – Adorama, B&H Photo, Amazon, UK, Ebay

Cactus – Website


  1. Tim Henrion 3 years ago

    > X-TTL Firmware updates will be available from the Cactus X-TTL microsite.

    Firmware updates will be available *when* on this “microsite”? Right now it says “COMING SOON”.

    • Greg 3 years ago

      After they design and code them, of course! No doubt the marketing department has written the copy above in order to gauge interest in the software. If it seems likely they’ll be able to sell enough of the triggers to justify the effort, they’ll go ahead and write the software.

      That’s the way it works in the tech industry…

      • Author
        Flash Havoc 3 years ago

        I think Cactus would have had to have been planning and working on this from before the V6 II hardware was even conceived. It would be a long way off if they were just starting now. I’d say they have likely just had a few hold ups before the first releases.

        I’m not sure what the market is like for stand alone triggers like this, though the potential for the system is huge when you have a number of lighting manufactures desperately needing technology like this to stay relevant. Or if Cactus plan to expand into more strobes in the future themselves.

  2. Kristaps 3 years ago

    “Flash Compensate” is the feature I never knew I needed. Would be great if Godox added something like that to their triggers.

  3. Isaac 3 years ago

    I’m currently using a canon ST-E3-RT with 2x 600EX-RT as well as 4x YN-622C with a JinBei HD600 for Supersync photos (2 cameras, 1 flash).

    I just purchased a Fujifilm X-T2, could I use a single Cactus V6 II on the X-T2 and then put a Yn-622C or ST-E3-RT on top of that trigger so that I can use my existing triggers and only spend money on a single cactus? i want HSS and I don’t care about TTL.

    • Author
      Flash Havoc 3 years ago

      Hi Isaac,

      I don’t completely know the answer there sorry, though the V6II do provide the HSS pre-sync signal via their hotshoe on top of the transmitter. So saying you covered the TTL contacts, just leaving the firing pin, then a YN-622C stacked on top of the V6II transmitter should pass on the HSS signal.

      I’m not sure how the YN-622C would react if you didn’t cover the TTL pins, and I’m not sure about the ST-E3-RT in that case either. Though the ST-E3-RT will no work if you did cover the TTL pins.

      I don’t know how the new Cactus TTL firmware would possibly affect this either.

      You might want to check with Cactus, though basically using the YN-622C like a dumb single firing trigger pin with the V6II transmitter should at least work.

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