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Rear curtain slow shutter speed Sony with UWTechnics Trigger


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Posted (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 by JB_Cazajous
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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.

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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.

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Posted (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 by JB_Cazajous
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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! 

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