Thread: Out of focus some times, on some colours
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Old 12-01-2007, 08:32 AM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
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flat plates focus
When a filter or any other flat lens is put in the optical path between the objective and the image, the focus will move by approx 1/3 of the plate thickness.
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