How much weight do I need for my wetsuits for snorkeling?
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For the shorty suit with the hood in salt water, you might start by trying 10 lb. However, you may find that as much as 12 lb would be good to stay down in shallow water for photography. I use 10-11 lb for a 3 mm shorty with no hood, and I could probably even use a little more.
Don't go by the recommendations of scuba divers. I've rented weight belts in a number of places, and they usually can't believe that I am asking for as much weight as I do. Scuba divers are used to weighting for depth, not for water <15 ft deep, and they also have more heavy gear than snorkelers.
The two guidelines that I have read and tried for snorkelling are either weight yourself to be neutral at 15 feet, or weight yourself to be neutral at half the maximum depth you are diving to.
Something to consider for snorkelling in a wetsuit is that during the descent, the wetsuit gets compressed and you lose buoyancy. In scuba, that is not a problem, because it is offset by putting air into the BC, but in snorkelling, obviously that's not possible. So depending on how thick the wetsuit is, how much weight you need, and how deep you go, you can end up losing a lot of buoyancy as you descend, then having to kick a lot of weight up from the bottom. The keen freedivers I know wear a 5mm wetsuit or less, for just that reason--it allows them to wear less weight, and have a smaller buoyancy shift.
When I am snorkelling in really cold water, I wear the same 7mm farmer john and 7mm jacket, boots, hood, and gloves that I use for scuba. I wear 24 pounds of weight for scuba, but only 16 for snorkelling, and probably should wear less.
This weights me such that I am absolutely neutral at 33'. I am positive at 15'; and, at the surface (with a full breath of air) I float with the water level at the collarbone. When I exhale, the water level rises to my chin.
Of course everyone varies, but the above weighting is used by most serious freedivers.
Avoid the temptation to weight yourself to be neutral at (or very near) the surface. It will doubtless make your photography easier, but, will increase your odds of being a statistic. 90% of freediving blackouts happen at the surface.