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Secondary To Small?

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Posted by John Smith on June 16, 2003 19:10:33 UTC


I recently built a 10" dob with a mirror and secondary I purchased from someone. I am attempting to collimate but I think I may have a problem. The instructions I have for collimating say I should be able to see the entire primary in the secondary. I can't. I can only see the entire primary if I move my head around over the secondary. Is my secondary to small?


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