Nick
Ive shot a few.
1.coming from the outside back to a warm building.. your gonna fog up the lens. If you can,, leave a bag inside in a safe spot. And be prepared to grab another lens until the cold one warms to room temp
2. depending on how cold it is ( Minnesota cold is below zero..yup ive been in -10 shooting pics ) the pocket wizards will slow down or stop with OCF....so,, where a heavy coat,, keep the flash and the wizards inside they coat so the stay warm. Take your shots and get them back under the coat. cold slows down the battery big time on cycle times as well.
3. Obviously,, keep the clients bundled well and get your exposures before you have them take off the coats.. you dont want blue brides,,not pretty.
4. Shoot outside late in the day,, especially if you can get near a frozen pond or lake..reflections of the sun on the ice is awesome.
5. shoot raw and i would have a calibration target handy. I often have to warm shots up a bit in post to get colors to look right. ut i always want to know what the real color was.
6. keep your hands in gloves at all times, set up, take gloves off to take the shots and put back on when your done. Its hard to work a camera with frozen fingers and the tri pod and camera body will get cold quickly. If you cant feel the end of your fingers you will have a miserable time
7. let the cold lens stay cold when your outside. If you try to put it under a coat or keep warm, your gonna get fogging issues,, that totally sucks.