I'm a little confused about what you have. In your OP you say:
I have a wide angle lens that screws on the camera and the box for it says 'uses 46mm filters'.
But then in this post you say the lens is on backorder:
crum:
I did buy a new housing, but the lens are on backorder currently and won't make it before my trip.
My camera is not listed, Sony HC46. I will call them and say I want the URPro CY filter in 46mm?
thanks.
If you actually
have the lens then you can get the
46mm URPro filter for it, if not and you plan to use your
camcorder only, then you need a
37mm filter for the camcorder's lens.
Although Paulpost has the better idea, get the filter for your camera, not the lens. So if you don't use the lens on a dive, you still have use of the filter on-camera.
My best recommendation would be to call Equinox. From looking at their website, it seems that they should have included the filter, it's standard in their package. btw, Equinox probably gets their filters from URPro.
Also, in their brochure, they mention that an optional
External filter is available from them. This would be your best choice as you can remove it when necessary.