Hi - in answer to my own question ...... I've now disabled the electronic shutter in Nikon D850 the LV menu and I can now get flash sync as it using the mechanical shutter !

Barry

Hi - thanks for your reply.

Ive now tested the Nissin flash with my Nikon D500 and it syncs ok with that and stacks accordingly. I think the non flash sync with the Nikon d850 is around the electronic shutter. Helicon is using the electronic (silent)shutter rather than the mechanical shutter. I do ...

Hi - new user here. Although i've got focus stacking working without flash ok , I can't seem to get any flash to cooperate.

Set up :

Nikon D850
Sigma 105mm DG Macro lens
Nissin MF18 ring flash (also tried a Shanny SN600SN)
manual camera settings (eg f7.1 , 1/250 , ISO 400)
Autofocus set on camera ...