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Thanks for the comments everyone.
Peter, I'll look forward to catching you next time. Never have been able to see a chicken in that.
Bob, I'm still finding my way with the Astro-trac. The polar scope on mine was next to useless, optically and mechanically, so I replaced it with a Polarie polar scope and then added an aftermarket SkyWatcher illuminator which fits it well. I point the pier to true south using iphone apps, then mount the camera and check elevation with a digital inclinometer. That usually puts me close enough to see the Octans trapezium asterism in the polarscope, or even disregard the polar scope entirely and get reasonable results in 2 min exposures. Haven't tried any drifting techniques. For this image, I connected it up to my laptop and used Backyard EOS to manage the exposures. Apart from other things, it makes focusing accurately easier than just using live view on the back of your camera. I'd be interested to hear about your V align techniques.
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