Keep camera and lenses in a shoulder bag. It will act as a thermal  
buffer. Keep them in the bag unless you're using them. When you go  
indoors, let the bag sit a few minutes before opening it,  
particularly if it is humid indoors or if outside temperatures are  
sub-zero or it was very wet.

Unless you go outdoors and have the camera and lenses out for long  
enough to completely and thoroughly cold-soak in sub-freezing  
temperatures, you should have no problems. This is exactly what I did  
on my trip around the US last year, with days and nights of  
temperatures in the bitter 0-15 F range. A few minutes exposure to  
very cold temperatures will not make any difference at all.

Godfrey


On Nov 15, 2007, at 10:23 AM, Boris Liberman wrote:

> Hi there.
>
> It turns out that I have my tickets for Prague next weekend. I am  
> going
> to take my K10D, DA 21 and FA 43 lenses. The main issue that still
> remains to be resolved is that of taking the lenses and the camera  
> back
> and forth between indoors (warm?!) and outdoors (cold?!). I've no
> experience with this kind of shooting whatsoever.
>
> Any hints of practical nature or rules to be observed would be most
> appreciated.
>
> Thanks.
>
> Boris
>

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