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Shooting below zero

Started Nov 5, 2011 | Discussions thread
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Shooting below zero
Nov 5, 2011

I have googled for authoritative information on this, and searched the forum here in DPR. It appears the opinions are varied and many, some aligned, some tangential.

One "good" advice that keeps coming up is putting the 7D in a zip-locked plastic bag when entering a warm room after shooting below zero outdoors. This allegedly prevents moisture from making it to sensitive camea parts, or something like that. It's quite another challenge though to remember to do this all the time - assuming I switch from outdoor to indoor shooting 6-7x per day.

I'd like to ask - assuming I use the 7D under minus 15 to minus 5 degrees Celsius for an extended period (say, 5-6 hours), using weather-sealed L lenses all the time, is there something I need to do as proper camera care procedure before I enter a warm, 24-26 degrees Celsius room, aside from the zip-locked or air-tight container suggestion? Is the weather-sealing not drastically eroded by using an original Canon battery grip, or am I better off not using it?

What is the risk if I shoot in freezing temps over extended period using lenses that are not weather-sealed?

Off to some freezing spots in China soon, will appreciate advice or comments. I am from the tropics, I admit I am not used to shooting in below-zero places.
"Photography is therapeutic."

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