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  #1  
Old 01-03-2010, 03:38 AM
jacksonwarrior
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Primary mirrors
Does a Primary mirror in a telescope have only one focal length, or are you able to put the mirror in a longer tube?
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Old 01-03-2010, 02:10 PM
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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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Old 01-03-2010, 05:09 PM
jacksonwarrior
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thanks
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