Originally posted by howieb101 Here is my understanding. If you update the firmware of the 860 II to that
now supporting Pentax these flashes will work in PTTL if used with the XPRO-P. However, if the 860 II (N, C,F, versions, etc) mounted direct on a Pentax camera even with the updated firmware they will be
manual flashes
This is correct.
You'll know that the V860II is correctly switching between the "native" flavor and Pentax by looking at the LCD.
My TT685-C is the Canon version (with a Canon foot). It is only a TTL/HSS speedlight on my Canon dSLRs, but as an off-camera slave, if I use it with my XPro-C, it will say
Canon on the LCD. If I use it with my XPro-F/X100T, it will say
FUJI, and if I use it with my XPro-O on my GX-7, it will say
OLPS. I'm pretty sure that you'll see an indication of the V860II-C/V860II-N being in a "Pentax mode" if the firmware update is applied and an XPro-P is used.
The TT350-P, however, may only do P-TTL for the XPro-P. Some cross-brand combinations with the TT350 as radio slave do work in TTL, but my TT350-O only ever fires at full power in TTL when I trigger it with my XPro-C/TT685-C (manual ratio control and HSS still work). Flashpoint support told me that the TT350 is not designed to do cross-brand TTL.
You can also use the TT350-P as an on-camera transmitter, rather than an XPro-P. If the TT685-P and V860II-P come out, they also can be the on-camera transmitter unit.
Last edited by inkista; 10-31-2018 at 10:10 PM.