Here is a link to small selection of photos I shot with the Canon 7D on a two week liveaboard trip on MSY Seahorse, March 2011. The route we took was from Ambon to Sorong: Nusa Laut, Banda Islands, Pulau Koon, Misool, Waigeo, Dampier Strait. A total of 38 dives.
We saw practically everything from Pygmy Seahorses to Manta Rays, and soft corals of every possible color and form.
The 7D was in Ikelite housing, I had two Ikelite DS161 strobes with 12+12 inch Stix buoyancy arms, and the following set of lenses:
The majority of dives I ended up using my new Sigma 17-70 mm lens due to its versatility. At 17mm it is a quite a decent wide-angle, even for shooting Mantas - and at 70mm you can do some sort of macro, even pygmy seahorses are doable. With this lens I had the Ikelite 8" dome, which gives a very good image quality but is of course huge. Before this trip I shot only with the Tokina fisheye, but now I found that to be almost too wide angle and suitable only for special occasions. With the 60mm lens I didn't like at all to be forced to shoot only macro for an entire dive, when there was always the possibility to see almost anything.
Most of the time I shot with Manual exposure at ISO 100.
