Sony A7R3 with two Inon 330 - upper part of image dark ?

Hello friends

I sometimes have this issue where the upper part of the image is dark. What could this be ? It’s always a straight dark area so not sure ?

Only happens underwater in the housing.

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Shutter Speed too fast?

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That's my guess as well. I think sync speed on your Sony is 1/250th... with faster and faster shutter speeds the black band gets bigger and bigger.  

That's my guess as well. I think sync speed on your Sony is 1/250th... with faster and faster shutter speeds the black band gets bigger and bigger.  

Strobe sync speed for Sony cameras (with the exception of A1) is 1/160s. If you use a TTL-capable trigger, such as the one from UW-Technics, it provides more accurate timings and full-frame cameras (A7, A9) can go to 1/250s.

Edit: This is referring to interchangeable-lens cameras. Compacts (RX10, RX100) have leaf shutters that can sync all the way to 1/2000s.

I have a Sony A7 RIII, fastest sync speed is 1/250 with a Sony flash or external TTL such as Ikelite.

The 1/160 is correct for older cameras (such as my old A65)

4 hours ago, BigJeff said:

I have a Sony A7 RIII, fastest sync speed is 1/250 with a Sony flash or external TTL such as Ikelite.

The 1/160 is correct for older cameras (such as my old A65)

It depends on what is triggering it, the trigger needs to fool the camera into thinking there's a Sony flash attached.  If it's a manual trigger it needs to get the timing right to achieve 1/250.

Best thing to do is take a few test shots to see what minimum speed you need.

are you otherwise happy with the Z330s?? hope this helps get you sorted out! 

are you otherwise happy with the Z330s?? hope this helps get you sorted out!