What focal length? ISO800, 30secs with ICNR, f2.8, 16mm on a fixed tripod works for me with no noticeable trailing. Any longer gets stuffed up by sky glow. Hanging the DSLR off a GEM mounted scope would completely solve the trailing.
I stacked some 70mm frames for one of the CAAP guys with Autopano to reasonable effect. The price is down to 99 Euro too.
Andrew
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