Just back from a great trip to Santa Cruz Island over Memorial day. Did some teaching, and had just about two dives to do some Underwater Macro Photography. I recently purchased a Canon 100 mm USM, which I got to check out. Water was pretty murky, but being able to get just inches away from the subjects does wonders.
While shooting one of the Nudi's a Harbor Seal started tugging on my fins, and came right around in front; that's when I wished I had had a wide angle lens too.
Check out the photo gallery.