I have both the 12-24mm and the 10.5mm. For down south tropical stuff, I prefer the 12-24mm to give me a bit more flexibility in shooting larger animals. The 10.5mm is fine, but you really do have to get close.
For local wreck shots, I love the 10.5mm, definitely over the 12-24mm. I use twin DS-125s to get full coverage.
For local wreck shots, I love the 10.5mm, definitely over the 12-24mm. I use twin DS-125s to get full coverage.