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Old 25-09-2017, 06:29 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
My practical experience is in holding a target star image for subs of >10 min with a C11 at f10 on a slit gap of 20 micron - this is less than the average FWHM I experience.....
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