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Old 26-05-2014, 07:30 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
How to actually measure spherical aberrations?

How do you actually measure the SA of your objective??
Do I need to do a focused star image test with the outside annulus, the central region being covered and compare the focus position with a similar test just using the central region??
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