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Hi Odille
You don't need the polar scope. I didn't have the polar scope for any of these shots. Just aligned south with my iPhone compass, and set the latitude (on a very rough scale) to the latitude I was at.
At f/4 you'll need around 1min exposures, which is more than possible with the polarie when aligned. You'll want to use ISO1600 on your 40D. Not sure about the 1Ds.
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