fresnel lens to magnify things underwater

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gcbryan:
I'm just curious as to the need for additional magnification under water. Isn't water already magnifying things an additional 25%? I guesst I've just never thought about needing any more magnification while underwater. Although reading my guages is getting a little harder as I get older:)
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Some of us like to check out the details on the smaller critters in the water column and on the rocks. :D
 
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