Thread: Primary mirrors
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Old 01-03-2010, 02:10 PM
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Geoff45 (Geoff)
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Geoff45 is offline 		 
Join Date: Jul 2006
Location: Sydney
Posts: 2,631
The primary has a fixed focal length. However, by using a Barlow or focal reducer you can change the size of the image in the focal plane.
Geoff
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