Alex Horvath wrote:
On my enclosed deck kayak, I keep my standard SLR camera in a
waterproof deck bag. I may be doing some tropical paddling on a sit on
top. I could put the deck bag behind me but it has a dry suit zipper
which takes some effort to open. I suppose another possibility would
be some sort of water proof chest bag.

Anyone done much photography from a sit on top with a standard (non
waterproof) camera?

Try to check housing system that divers use. They're expensive but they
fit some of the SLRs. They're a bit bulky but they don't require to be
opened to use the camera and are of course totally waterproof.

I use such a system with a digital camera

Laurent