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IMHO I think you'll find seeker that using the 15 - 30 sec images your alignment doesn't need to be as accurate, plus there is no need to take dark frames.
I've tried to do film imaging when I first began experimenting with astrophotography but gave up as I couldn't get my alignment accurate enough with the scope I was using. I was still getting star trailing from tracking errors. After a few minutes the trails were not as bright due to reciprocity failure but they were still there. Damn frustrating too.
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