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Old 25-10-2018, 12:14 AM
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blink138 (Pat)
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Join Date: Aug 2009
Location: perth w.a.
Posts: 2,275
32 south
we don't use a polarscope in ours, my brother has a very accurate compass, once set up we start with a minute exposure on say a 70mm lens, if eggy we adjust the azimuth and do another minute ......... then 2 minute with smaller adjustments
it does not seem to take us that long to get our 2 min exposures and then we are on for the night
going to the 200mm seems to only need the finest of azimuth to get round stars, so we always aim for this and so then we have no problem with the lower f/l lenses doing 2 minutes
pat
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