Thread: Parfocal? Do I need to do it at night with a star?
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Old 29-09-2011, 11:04 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
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No, you can do it any time with any object. The eyepiece doesn't know (or probably care) who or what provides the image to focus on.
If all eyepieces are brought to the same focus without re-adjusting the focuser, then they will be parfocal.
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