[LargeFormat] Keeping Film Cool

[john frost]

About a century ago, astronomers discovered the benefits of chilled
film. At really low temperatures (-40F), film tends to lose its
reciprocity failure. Today's amateur and professional astronomers use
dry ice to chill film during exposures of several hours - this works
well with color materials as well as b&w. 

FWIW

john (:>)

"Hornford, Dave" wrote:
> 
> Was out on the prairie today experimenting with my new gear (Rodenstock
> 180 Sironar-N, Fujinon 90 SW, and some filters) taking photographs of a
> grain elevator. It was nippy (forecast for -12 C, but only made it to
> -19 C), especially when the wind kicked up.
> 
> While confirmed my belief that architectural photography is far more
> difficult than it appears - although a 98 year old wooden building with
> flexible lines may be beyond my skill - I was thinking about keeping
> warm. This led to a consideration of  film. In hot weather film must be
> cooled, is there a contrary requirement to keep film warm when it is a
> tad chill outside? Does the performance of film change when its cooler?
> 
> Regards Dave
> 
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