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4" Polarex/ Unitron
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25-03-2012, 06:37 PM
DavidU
(Dave)
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Join Date: Jul 2007
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You should be able to correct that by changing the 3 air space shims with a different thickness. I have done this a few times.
Quote:
Originally Posted by
alocky
but it still has about 1/2 wave of spherical abberation.
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