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Old 07-12-2009, 05:41 AM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is online now
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,027
There may be some minor thermal effects, but if the mirror is locked the zero shift focusers seem to do a good job!
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