Orion's Sword region

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2009 January 23rd  from Dengie Marshes, Essex, UK
 Canon 20Da DSLR  camera with Canon 200mm telephoto lens at f 4.
Tracking on an Astrotrac mount.
60 mins total exposure 20 no x 3 minute exposures stacked using Deep Sky Stacker
800 ISO and IDAS filter mounted over lens front.

Unfortunately the IDAS filter has caused the brighter stars to become distorted and some isolated reflections.
The night was very cold with occasional interference from high cloud through which I carried on photographing.

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