dives, techniques

Remote strobes

ERB_4588.jpgIt’s been a while since I played with remote strobes, so this weekend (having been been blown out by poor Bank Holiday weather) decided to try this technique in a local quarry. In a bid to get the creative juices working at a less familiar site, my buddy and I picked the National Dive Centre in Chepstow, a location I have dived less often than other fresh water sites in the Midlands.

The idea with remote strobes is to light a subject without using the strobes attached to the camera. This has the advantage of using a light source close to the subject but further away from the camera and so giving good lighting but with a minimum of backscatter.

The NDAC, like many quarries has a lot of scrap metal and I chose a Wessex helicopter as my subject. The aircraft was reasonably intact and has a large (dark) internal space. There’s a lot of setup time needed for remote strobe work and I was privileged to have a buddy prepared to set aside his camera and carry the extra strobes for me. It was just as well really, as of the two strobes I was hoping to place, one of them refused to work at all (despite having worked when I tested it before the dive). The vis was quite good (about 8-10m) and so I tried working from further back than usual, to catch the whole aircraft. I tucked the strobe (a Sea & Sea YS-110) inside the doorway, set on half power and pointing inward toward my buddy, who swam slowly out of the doorway.

The exposure was set as if for available light only, with the ISO high enough to provide a shutter speed fast enough to freeze the bubble motion (1/100s); since I was at least a few feet from the nearest part of the wreck, an aperture of f/8 was enough to ensure the whole frame was in focus. I used a single strobe on a low power setting solely to trigger the remote strobe.

I had my buddy shine a torch towards the strobe so that the flash light is “connected” to the subject. It takes a lot of practice to get all the aspects of this technique right and in hindsight, the strobe is not far enough behind the doorway, some flare is still visible. The diver is perhaps rather smallĀ in the frame and so the effect of the remote strobe is rather subtle; on the whole I think it needs a smaller subject, so that I can have the whole wreck but with the diver larger in the frame. Just another reason to go back and try again…