1)i can walk straight outside with my camera in my hand(no bag)
2)Shoot some photos
3)Put camera into airtight ziplock bag, outside(do i need to take battery out?)
4)Bring it inside, let it warm up(how long approx.?)
5)Then take it out of the ziplock and put it into the camera case.
Correct, except you don't need to leave it out of the camera bag when it's in the ziplock bag. In or out, it doesn't matter, although it will reach room temperature more quickly if it's outside the camera bag (but still in the ziplock to prevent condensation).
To answer the question in #4: until it gets close enough to room temperature that it won't form condensation when you take it out the bag. This can be a few hours to half a day depending on how cold it is.
Anyway, today was the coldest day so far this season, a steady -10C. There are three things I've noticed so far:
1) Battery life sucks. Want to use the built-in flash? You'll get 2, maybe 3 shots. No big deal, I have a spare kept warm inside jacket pocket, though it's a bit of a pain to keep swapping them.
2) The LCD becomes slow. Scrolling through images cross fades, not cuts.
Is this bad for the LCD?
3) The zoom ring on the kit lens becomes stiff and sticky.
It's supposed to be -19C tomorrow.
slow acclimatization is the best way both hot to cold and cold to hot...
Warm to cold isn't going to cause condensation. Take a drink can that's been sitting on a dry shelf at room temperature and put it in the freezer. You see any water droplets forming? Now take it to bring it back to room temperature out and it sweats.
Theoretically, if you had your camera sealed in a total vacuum (thus having no air to contain moisture)
or brought it in from the cold to a 0% humidity environment; then used a hot blow dryer to bring it up to room temperature in a matter of seconds or minutes, condensation would not form.
However, the different rates at which the plastics, metals and other various materials expand and contract from hot and cold would wreak havoc on the sensitive and highly-strung parts
I just can't honestly see going out in -30C windy weather to take pictures. Of what? White?? hahahaha!
You should see what a snow flurry looks like with a sunny sky causing reflections off of every individual flake. Absolutely incredible.