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Old 01-02-2014, 05:51 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,906
Our cross wire eyepieces used to be around 10-12mm fl, so what you have sounds OK.
Keeping the guide star in the corner - half hidden by the wires was the technique used.....
This could/ would give 20 to 40 micron star images on hypered 2415 film.
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