JB_Cazajous Posted May 30 Share Posted May 30 (edited) Hello I use a UWTechnics flash trigger with a sony A7RIII and Nauticam housing When I want to use my strobes to take slow shutter speed photos, I have a problem I put my Inon Z330 strobes in Manual mode, rear curtain flash on the Sony A7RIII and below a speed of 1/15s it does not flash correctly I explain: For speeds of 1/15s and more, no problem, a pre-flash fires, then 1/15s later the real flash appears on the rear curtain However, from a speed of 1/13s or less, the flash on the rear curtain is very weak (like a second pre-flash) and does not sufficiently illuminate the scene to be photographed. On front curtain it works well for any shutter speed This problem appears only on rear curtain with speed under 1/13s Do you have an idea to solve this problem? Thanks you Edited May 30 by JB_Cazajous Link to comment Share on other sites More sharing options...
FrancoisC Posted May 31 Share Posted May 31 (edited) Hi JB did you set your Z330 to ignore the preflash ? small button on right. Push or pull, I do not remember... Edited May 31 by FrancoisC Link to comment Share on other sites More sharing options...
JB_Cazajous Posted June 1 Author Share Posted June 1 Hello Francois Actually the function of this button is not to ignore the preflash, but to let my Z330 understand if my camera is going to send a preflash to it. If I activate it (button pressed) the Z330 will consider the preflash of my camera as the main flash A black image follows. Link to comment Share on other sites More sharing options...
Chris Ross Posted June 1 Share Posted June 1 I would think the problem lies within the camera/UWT trigger combination. When in manual the INON strobe just fires when it receives a light pulse. You might be best to message Pavel if he doesn't chime in. Link to comment Share on other sites More sharing options...
JB_Cazajous Posted June 2 Author Share Posted June 2 (edited) After many tests, I finally found the solution!!! 😁 On the UWT trigger there is a small dial which allows you to configure the trigger according to the strobe you own This one was on position 6 which corresponds to the Inon Z330 strobe This allows you to use the Z330 in s-TTL mode, but it creates a pre flash Switching this dial to position 0 completely disables TTL mode, but it also disables preflash All I had to do then was press the preflash button on my Z330 strobes No more rear-curtain flash sync problems below 1/15s Edited June 2 by JB_Cazajous 2 2 Link to comment Share on other sites More sharing options...
ChipBPhoto Posted June 2 Share Posted June 2 37 minutes ago, JB_Cazajous said: After many tests, I finally found the solution!!! 😁 On the UWT trigger there is a small dial which allows you to configure the trigger according to the flash you own This one was on position 6 which corresponds to the Inon Z330 strobe This allows you to use the Z330 in s-TTL mode, but it creates a pre flash Switching this dial to position 0 completely disables TTL mode, but it also disables preflash All I had to do then was press the preflash button on my Z330 strobes No more rear-curtain flash sync problems below 1/15s Excellent news! I have the same setup. Currently I have the UWT trigger set at 0 and use the Z-330s in manual. If I want to change to TTL, this will be very useful information. Thanks again! 1 Link to comment Share on other sites More sharing options...
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