Hi,

might be someone can help. Wanna try HSS here in LaPaz shooting Sealions in shallow water with a lot of sun.

If I set the UWT board in manual mode (dial 0) my Retras shot flawless if I set it to TTL mode (dial 7 for the Retras) the flash doesn`t fire (tried in M, TTL, HSS mode). Tried all settings from 1 till 10 on UWT board. No flash. Also checked settings on Nikon D-850 menu like 2nd curtain, flash sync...... Also set 1/250fp in D-850 menu so flash should be set in M mode by UWT board for using HSS as described in UWT manual. If I set the UWT board to M (dial 0) and use HSS mode on the Retra i have underexposure (black) in the bottom of the picture. Any idea? Contacts on Hotshoe also checked.

Br Markus

I'm having trouble following. Is the issue only in HSS that the flash is not firing? Also to be clear are you saying the flash is not firing or is it not syncing? From what I can see the sequence is:

• Set the UWT dial to position 7

• in camera menu set to Auto FP in the flash sync speed menu

• Set the retra strobe to the HSS setting.

The manual doesn't mention using dial position zero in conjunction with HSS sync mode on the Retra. The Retra is in manual mode with when it receives HSS signals, there's no TTL with HSS. You can adjust flash intensity with the power knob on the strobe.

I use HSS a fair amount on my Retras with a D500.

I have the UWT trigger on the usual Retra setting, 7. I have everything else set for Manual. When I want HSS I just move the Retra strobe dial from M to HSS and change shutter speed from, say, 1/200 to, say 1/2000.