Sunday, 6 February 2011

Off-camera underwater strobe

I have started mucking around with a remotely triggered strobe underwater.

The aim of this is to create more interesting lighting. Using an off camera strobe to add rim lighting or even back lighting can add depth and drama to an image.

The tricky bit is actually getting the remote flash to fire. Water absorbs light much more than air so the in-built Inon slave sensor is only effective over about 1.5m. Any further back and the main strobe will not trigger the remote strobe, at least in our murky sub-temperate water. 
There are a couple of solutions.
1. Use a really long sync cord, either fibre optic or electrical.
2. Use a more sensitive electronic remote sensor. These are available for Ikelite strobes but not my Inons, although one should be available very soon. 

I have ordered 10m of fibre optic audio cable to try a long sync cord. One end will sit in front of my main strobe and the other will connect to the remote strobe. This means the cable will be visible in the shot of course.

Stay tuned for new developments.

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