Hello!
Last night I and my Friends we have a great observation night in Oderne, in south Poland – beautiful place among Beskid mountains. We have very good, clear sky but there was very chill. We have very low temperature at night. About -20°C (about -4°F). In central Europe during the Winter, it is nothing strange. But it is necessary to be a tough to make all night observations in this conditions ;)
After many hours of the good observations we take a little nap. We have resumed our observations at 4 AM to get the first Venus and Saturn since few months.
There was intense, severe frost.

Object: Planets Venus and Saturn
Scope: SCT 5″ with SW UWA58 9mm
Time and date: December 5th, 2010. About 4:00 AM
Place: Oderne, Poland
Weather: Clear, dark sky. Heavy frost.
Technique: Graphite pencil
Tooling: Some correction with PhotoShop
Observer: Aleksander Cieśla (Wimmer)

I have a interesting foto from that observations.
There was really heavy frost. After all my equipment was operating quite good :) There was strange noise from motors of my Celestron SLT mount, like howling ;) But all night long it was operating correctly. I have little problems with corrector plate of my C5 SCT too, but dew shield works not bad. Most problems we have with the eyepieces. Puting the eyepiece to the poket at several minutes – that was an easy solution of this problem.
During that night my equipment looks like that: :)

Thank You, and sorry for my bad english.