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I wouldn't recommend our Hydrophobia for this. They're throwing buckets of water directly at the lens! That's just nuts. The Hydrophobia is great for rain, but I don't think it's wise to subject the front lens element (even with a UV filter) to a wall of water. It's going to seep pass our cover and possibly the seals on the lens. I'd suggest an underwater housing. They're expensive, but that's the price of admission if you want to walk out with functioning gear.
Randy (Think Tank Photo Product Specialist)
I agree, completely.
I have two TT Hydrophobia for shooting sports and etc. in the rain. They're great, even in a sustained downpour, but you need something waterproof for full immersion, for the crazy stuff described above.
The Ewa-Marine mentioned earlier by Ian and myself would probably work fine, but it's a kind of clunky thing to use. The Outex flexible housing mentioned by acktdi looks really good. In fact, I bought one last night. It's for my sea kayak and snorkeling, not for Songkran.