Panasonic GH4 + Cactus v6ii+ Panasonic FL360L - HSS Problem
I also can confirm the same HSS problem as user Nikinik7503 except that I am using the GH4 along with the Panasonic FL 360L. Everything syncs & functions perfectly up to 1/400s. At 1/500s the flash atop the Cactus v6ii trigger produces banded images where only the top 1/3 of the image is visible, leaving the remainder blacked out. This is the constant result of all TX/RX trigger & flash unit settings combinations (including adjusting curtain settings within the GH4 itself) as I've spent literally the entire day thus far testing, unsuccessfully.
I received my units (x2) on yesterday with firmware version 1.0.006 installed. And after experiencing this HSS problem I upgraded the firmware to current 1.0.008 in hopes of resolution. Unfortunately the upgrade had no effect.
One other interesting & unfortunate discovery is that when setting the RX unit as 'Panasonic' flash system & 'Panasonic Auto' or specifically 'FL 360' I am only able to fire 1 successful burst of flash. Subsequent shots do not trigger the flash to fire at all. Without switching the unit off & reverting to an Olympus profile. This again is the case with all combinations of TX/RX & flash unit settings combinations. I intitially thought this might have something to do with TTL mode being activated on the TX unit, but I still experienced the same problem after deactivating TTL mode & testing with all settings combinations. I've 'factory reset' both units numerous times.
Also my V6ii never auto-detects my camera properly. It always boots up as auto causing me to have to manually set it as Olympus.
This product seems like an excellent tool otherwise, but definitely frustrating to say the least in getting the HSS & TTL to function properly.. I really hope you guys will place priority on resolving these issues for us GH4 & future GH5 owners.We'd love to enjoy the full functionality of these units too. ;-) If anyone has this setup working successfully, please share the knowledge.