Hi Rob,
the green water filter is also a kind of red, but slightly different to the blue filter. It´s a little lighter, but you could use the one you have also in green water, though it is not optimized for greenish water. Since visibility is usually poorer in green waters you might have more difficulty in getting your camera focussed. The Green Water Magic Filter is very thin and therefore “consumes” less light. I have been using it for my last few dives in green water now and I was surprised by the good results.
Regards, Marc
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