Absolutely useless! Yes, sea creatures can still see light. They still hide just as they would without a filter. And you can't take a photo with a filter on your light without everything turning red or maybe black because there's not enough light. I used them on a trip and then missed the return window by just 2 days or I would have returned them. That's a waste of money. Don't buy this. The people who wrote the marketing copy couldn't use it.
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