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Hi John, at 50mm focal length you can go to around 6 secs on a target
at 0 degrees declination, about 8 secs at 40 degrees dec., about 12 secs at 60 degrees, and around 30 secs at 80 degrees. The star cloud is around -30 degrees, so 7 or 8 secs as suggested by Rusty would be good.
raymo
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