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dbh:I highly recommend the Sigma 15mm FE. About $350 US and sharp! As Kristin said, the 10.5 is VERY wide....
I am one of only a few people that I know that doesn't like the 12-24mm. I sold mine after 2 dive trips and bought the 17-35mm which is a better quality lens and its f2.8...but not as wide.
If you look in my Grand Cayman gallery, all of the WA shots were taken with the 15mm Sig
Dave.
catherine96821:YOU! hey what is the WA you use?
are you the guy who doesn't like the 12-24 mm?
and...oh he does worse things than dangle his hose. He is a flat out ninja diver
though.