Quote:
Originally Posted by OzEclipse
If the device can have a small optical polar finder attached, there are two stars, mag 6.8 and 7.8 that straddle the SCP by just a few minutes. Shown in the attached chart. These can just be seen in a 10mm diameter polar finder in a small tracker and are an easy reference for accurate optical alignment. I've been using these for many years with great success.
cheers
Joe
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Me too
About two years ago, I aligned my AP1600 with it's right angle polar finder scope, on the SCP location on your chart, this took just a few minutes and it meant subsequent gotos placed my targets on my chip or occasionally just off (FOV=38'X30') at FL=1120mm, so mostly within about 10 arc min all over the sky and more than accurate enough for good tracking and superb autoguiding.
Joe makes some good points and I would say that for camera lens work Leon, your PA looks good enough for exposures of at least several minutes, depending on the FL of the lens.
Mike