Im not really into the underwater photagraphy, yet. But it might be worth your while to check at a few auto shops I know u get a spray for car windsheils that helps with water clearing off the windsheild. Dont really know if it will work or affect the housing in some way, but it might be worth a try.

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Dive safe and shoot straight
- Hénré -
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"Thinking is the hardest work there is, which is probably why so few engage in it"
- Henry Ford -