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Hello,
I'm afraid this will be another long post, but let me explain how I understand the different triggers and flashes from Godox, and how can we configure, as a general rule, any combination to make it work for HSS.
As a general setup, we can get HSS meeting two requirements:
1. A trigger (FT16,XT16,XT32,X1T,XproC, you can add any other dumb/single trigger here) stacked on top on the Cactus V6II, cactus configured as using manual flash
2. A Godox flash with HSS forced AND a valid receiver, so the flash can receive the fire signal from the trigger
Most of the old and manual Godox flashes can be fired this way: you force the HSS mode on the flash, then our nice Cactus V6 II 'captures' the HSS signal from Pentax camera and send it to the stacked trigger. The trigger send a fire signal to the flash at correct timing, the flash fires with the near-continuous HSS light, and you get your frame illuminated. Everything is nice and wonderful.
Ok, so now we have the AD200, a more advanced flash, with HSS, TTL... so we do the same, press the rear button to force HSS, put a trigger on top of our Cactus V6 II and ... we get no synching at all, only at full power.
The problem with the AD200, and probably similar flashes, is that in wireless mode, using its internal receiver, you cannot force the HSS mode, yes you see the 'H' symbol on the display and yes, you see that the AD200 is firing when you are above 1/180, but it's using normal pulses, no HSS, you don't get light in your frame. To enable/disable HSS mode on the AD200 when your have wireless mode on, you need a valid trigger that could send a kind of commnad/signal to do that, it is my understanding, if such signal is not received, the AD200 will remain in normal mode.
The only way on the AD200 to really force HSS, is by disabling wireless mode. But with wireless mode disabled, your internal receiver is disabled too, so you need another receiver. The AD200 with wireless mode off, is just similiar to any other manual flash, so you can configure the same settings you could use for a V850 or AD360... but you need a XT16 receiver, not expensive anyway.
About the Godox triggers, in my view, they have three different 'capabilities':
A. Can send a signal/command to fire the remote flash
B. Can send a signal/command to enable/disable HSS on the remote flash
C. Can 'talk' about TTL things...
The XT16 is the most basic trigger and support only 'A', XT32 supports 'A' and 'B', and XT1 & Xpro support 'A,B,C'.
But, obviously, to get all that wonderfull capabilities, you need a proper Canon or Nikon camera. If not, if you just put any trigger on top of your Pentax camera, you'll only be able to handle with 'A', that is, to send a fire signal, and only up to 1/180.
So let's get the Cactus V6 II, this trigger is able to send a fire signal to any trigger on top when you are above 1/180. But there is more, as the Cactus can 'talk' with several Nikon, Canon... flashes on top, talking not only about firing, but about HSS too.
The XT32C is a trigger that can handle with HSS, is able to fire the AD200 in manual mode with HSS, but the Cactus V6II is not able to recognise as a real Canon flash, and the XT32C doesn't see the Cactus as a real Canon camera, so you can only send fire signals. If I want to fire my AD200 with my XT32C, I need to disable wireless mode and put a XT16 receiver. I think that's exactly what happens with your X1T-N.
The XproC is different, if you configure the Cactus with Canon flash - Godox V860C profile (maybe other profiles are valid too), the XproC can see the Cactus as if it were a real Canon camera, and the Cactus can see the XproC as a real Canon flash. So with this configuration you can handle not only with firing the remote flash, but also HSS, this way the XproC is able to enable or disable HSS mode on the AD200, depending on your speed. Automatically, you donīt need to do anything on your AD200.
So, as a conclusion, the most important points to get HSS working, in my view are:
1. Can you really force the HSS mode on your flash?
2. Is your trigger really 'compatible' with the Cactus V6 II ?
I think your X1T-N is similar to the XT32C, that is, is doesn't see the Cactus as a real Nikon camera and the Cactus doesn't see as a real compatible Nikon flash.
The last checking you can do, is to configure your Cactus V6 II with Nikon flash, and check every nikon profile, I think the Godox V860N profile should be the most 'compatible'. Let the other settings as Howieb told you. If you couldn't find any good Nikon profile, then your only option is to proceed as disabling wireless mode etc.
About the SYNC setting on the XproC. When this setting if OFF, the effect on the camera is that you cannot go above 1/180 speed, so it's limiting your camera to normal sync speeds. If the setting is ON, then you can go above 1/180. This is another indication that the Cactus V6 II and the XproC are really compatible, because you are changing a setting on the trigger and you see an effect on your camera.
I recommend the XproC not only for saving an extra receiver, but for the 'automatic HSS' with the AD200.
Regards.
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