For Photography, these are the one I personnaly use and like a lot: HEAT convertible mitts. They allow to use your fingers and cover them back. you can stash a heat pack inside them.
I've made a review on my bushcraft channel on youtube. Excuse my spoken english, I usually speak french, but if you are interested, here's the link: http://www.youtube.com/watch?v=PfD46wEOuYE