I have used my Hasselblads, 503 CX and 903 SWC, in cold weather without any problems. I just watch to see if there is any condensation appearing when I take it inside or outside and I wait for the condensation to clear.
Winding quickly in cold dry weather can cause static discharge across the film. It looks like lightening on a negative or slide. I have had this happen to me. As @BrianShaw states wind film slowly in cold weather.
Sounds like a good time to switch off the Motor Winder's and Drives especially.
I have the remote battery pack for the 645/645n, so the battery can stay under the coat and a cable goes to the camera. The battery insert of the pack looks like from the original 645, but the cable fits as well the 645n (and I guess 645nii). Actually, I have two of those, in case somebody needs one...The only issue I've ever noticed with my Pentax 645Nii is shortened battery life in cold weather.
For most of my adult life I've lived in Texas and California, but this winter I am staying at a place with average temperatures fluctuating between 20-35F. I have never used my Hasselblad in such conditions. Can I load a roll of Provia at room temperature and just walk outside and start shooting? Are there any gotchas?
I have the remote battery pack for the 645/645n, so the battery can stay under the coat and a cable goes to the camera. The battery insert of the pack looks like from the original 645, but the cable fits as well the 645n (and I guess 645nii). Actually, I have two of those, in case somebody needs one...
Never a problem with Hassy shooting in subzero weather. Although I have never experienced static, I advance film slowly in cold weather. (Not because of potential damage to wind mechanism.) For shooting in stormy weather, whether snow, ice, or rain, I use an ugly but functional Kiev 35mm camera, more expendable than a pricier Leica or my other cameras.
Going into house, just warm up gradually in a cloth. Even when entering a warm humid place from relatively colder air, lenses will often fog up. After short while condensation evaporates.
I certainly don't know everything about cold weather but my Rolleiflex never even seems to notice. I walk in and out at will with that camera and I have used it in temperatures down to 40 below zero Fahrenheit.
The only issue I've ever noticed with my Pentax 645Nii is shortened battery life in cold weather.
I have had cameras with older lubricants show problems at very cold temperatures. As an example the shutter on my Pentax SV refuses to work when it gets to 25 below zero Fahrenheit or colder, but above that seems to present no problem. Still does as a matter of fact. I suppose I should get it cleaned but it seems to work fine other than that so I haven't bothered.
I guess it is possible for moisture to freeze inside the camera if you come from a very moist, warm interior out into a very cold outdoors but I have never personally seen that happen and I have lived and used cameras in some very, very cold country. In my experience, unless moisture is introduced to the interior of the house somehow, everything from indoors to outdoors is pretty dry in very cold weather. I used to keep a pan of water sitting on the wood stove to introduce a little moisture indoors.
As for film, no problem.
Of course, I have never tried to shoot film in Antarctica. :d
EDIT - I should say that recently serviced cameras with modern lubricants have a much better chance of surviving the transition between warm to cold and back again. But in all cases you should do what you can to reduce the amount of moisture your camera is exposed to. Dry, not humid, conditions are always better. Humidity will always result in some degree of corrosion which will slowly affect the small parts, springs and screws inside your camera, particularly mechanical cameras. If you are moving your camera from a warm, humid house to cold, dry outdoor conditions it will not hurt at all to do everything you can to keep it dry.
Slow down, Mr. Andretti.Camp at high altitude the night before, then drive downhill fast the next morning, see something interesting, pull out the camera, and it fogs up. It might be relatively low humidity at both extremes, but it doesn't take all that much if the thermal shift is significant.
It happened this summer below Sonora Pass. Got up really early and headed downhill for early morning light at low altitude. No use - all the lenses instantly fogged, and I didn't want to wait another 20 min for them to clear up. Had to beat the PM commute traffic here in the Bay.
That route has recently be repaved, but there are still only a few straight sections on it. One year I was backpacking with a fellow who worked in the Service Dept of a Porche dealership. On the way downhill we passed a trio of father and two sons parked along the road, each with his own sportscar. One son had a Viper and another a Ferrari. But the father had a carbon fiber $800,000 Porsche that my pal claimed was only one of three in the entire nation. He said it had a unique sound almost like an Indy car, and wanted me to hear it. So when they started catching up to us, I slowed way down just to frustrate them on the winding narrow road as long as possible. Then that straight stretch showed up, and VROOOOM, vroom, vroom, all these went past at over a 100mph in probably just third gear. That's where it got interesting ....
There was an intersection right there too, with a Highway Patrolman at it. He just sat there staring with his mouth open; and then he seemingly thought to himself, This is the only opportunity in my life to bag something like that. So past me he went, and many miles further downhill after another long winding stretch clogged with logging trucks, he finally caught up with all three of them.
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