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The bane of DSLRs. In winter if the ambient temp is around 5 or 6 degrees
with modern DSLRs you should be able to use ISO1600. If it is lower than that, you could use 3200. In summer if you limit to ISO800 and take lots
of subs, you should get acceptable results. I personally would get your rig up and running, and see what results you get before moving on to cooling the camera. If you are happy with your results, you might decide to move on to a cooled camera. Having said all this, if you enjoy fiddling about, by all means make a D.I.Y. cooler box. They do bring possible problems, such as
condensation on the sensor, and problems of access to the camera's controls
or screen when the box is fitted.
raymo
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