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Posted by c2cdiver on April 08, 2006 at 16:26:22: In Reply to: Eric's Images of Catalina with the Sea Divers posted by seahunt for Eric S on April 05, 2006 at 19:24:01: Instead of the extension tube, try a screw on diopter. The higher the + the better, you can even stack them. Just be sure to screw it on underwater, or you may not be able to remove it. Also, check for bubbles. There is a 60% loss in water, thus a +10 in water is only a +4 magnification. Besides the magnification, it will also reduce the focal length. How much? Stick the setup, in a bathtub and take a picture of a ruler. With an external filter, you can always take it off and shoot the 20mm at Harbor Seals
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