I start out with
Foxgloves Grip from Naturescapes. These go a long way, but are thin and sensitive enough that there's not much I can't do to the camera with them on. I was even able to tie a few flies on while wearing them on a recent fishing trip in the snow in Idaho.
When it gets colder I add on top some fingerless fleece fishing gloves... Simms, REI, Patagonia, etc.
Nill