Cactus X-TTL – For Olympus / Panasonic & Pentax – Now Available



Cactus Image have announced the addition of Olympus and Panasonic support for their cross brand X-TTL system, using with the Cactus V6 II and V6IIs radio transceivers.

Adding to Pentax TTL support available since November 2017, and Sigma, Sony, and Fuji already previously available as well. With Canon and Nikon TTL support to follow.

For existing V6 II & V6IIs owners the updates are available free of charge, via user enabled firmware updates available from the Cactus website download page.




The unique Cactus V6II and V6 IIs transceivers originally provided HSS, Remote Power, and Remote Zoom Control, for Canon, Nikon, Fujifilm, Olympus, Panasonic, Pentax, and Sigma cameras and speedlights, all at the same time.

As well as with Cactus’s own RF60 & RF60X speedlights.

And with the recent X-TTL firmware updates the V6II/s will support automatic TTL exposure as well, in the same cross-brand environment.

The updates are system specific though, so you will need to choose the option to match your camera brand.

A Sigma camera for example, will provide wireless TTL with Canon, Nikon, Olympus, Panasonic etc speedlightes. As well as flashes that run on the same camera system (Sigma in this example).

There are some limitations between systems though –






Cactus Press Release: Cactus X-TTL for Olympus and Panasonic is available now


Hong Kong, December 1, 2017 – The highly anticipated X-TTL firmware version for Micro Four Thirds camera systems – Olympus and Panasonic, is NOW available!

Besides retaining the revolutionary cross-brand abilities of remote power control and wireless HSS of Canon, Fujifilm, Nikon, Olympus, Panasonic and Pentax flashes simultaneously, the new system-specific X-TTL firmware adds cross-brand wireless TTL both on and off-camera.

Features at a glance
  • 1. Cross-brand wireless manual power and zoom control control with HSS/FP support of Canon, Fujifilm, Nikon, Olympus, Panasonic and Pentax flashes. *1
  • 2. Cross-brand wireless TTL of Canon, Fujifilm, Nikon, Olympus and Panasonic flashes. *2
  • 3. Two Exposure Locks offer consistency with the convenience of wireless TTL.
  • 4. Rear-curtain Sync is supported in both on and off-camera. *3
  • 5. Works seamlessly with Cactus RF60X and RF60 to support remote HSS, TTL, as well as power and zoom control.


New Protocol and Upcoming Firmware Releases

Since the last release of Pentax X-TTL firmware, a new wireless protocol has been adopted. *4 To work seamlessly with a Cactus RF60 and RF60X, be sure to also update to the latest firmware, version A02 or later.

With the Olympus (M43) firmware now available, the remaining camera systems Nikon and Canon should be released during the first quarter of 2018 as scheduled. Stay up to date for the latest releases on X-TTL’s microsite:

To download the latest firmware versions for each of the Cactus devices, get the latest Cactus Firmware Updater and you will be able to select the latest firmware versions.

Price and Availability

System-specific X-TTL firmware versions are FREE of charge. Download the Cactus Firmware Updater and select the corresponding system firmware to install the Olympus (M43) X-TTL firmware on the Cactus V6 II.

About Cactus

Headquarter in Hong Kong, Cactus designs and engineers professional wireless photographic lighting equipment – wireless flash triggers, wireless 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 system flashes due to special timing requirements so it must be paired with a Pentax camera in order to support HSS

*2 Applies to both on and off-camera setups.

*3 Rear-curtain Sync is set directly on camera menu.

*4 To understand more about the new protocol and how to update your firmware, please visit X-TTL microsite at





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 – AdoramaB&H PhotoAmazonUKEbay
Cactus V6 IIs – AdoramaB&H PhotoAmazonUKEbay


Cactus – Website


  1. So with this trigger my Lumix finally will have HSS M ocf??

  2. Mark A Zilberman 3 years ago

    I’ve Olympus and the unit functions only as a wireless trigger with the Olympus flash. The controls on the transmitter have no relation to outcome. You cannot over or under expose. The FP does NOT work. The only way you can use these is to put the flash and camera on manual and test to get the right exposure. This product does very little that it claims. I have bought it twice presuming the first was defective. I’ve spent long periods on the phone with the manufacturer in HK. This item needs to stop being promoted as having compatibility with Olympus cameras and flashes. It does not at the current time. I will keep it as an off camera wireless synch. But that’s all.

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