I really like the Sigma lens - I found that it had sharp edges and was very versatile in the water. I would love to see what your feedback is on some of the pics I took with this as well as the new strobe. I moved my 125 to my secondary strobe position and used the 161 as my primary.
Here is the link to my flickr page http://www.flickr.com/photos/pammurph
Here are a couple of my favs from the trip.
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Happy diving - DiverPam