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Originally Posted by CoombellKid
How do I figure CO out Mark. Do I measure the flat optical surface of the
secondary? then do some equation to allow for it sitting at an angle?
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Its simply the primary mirror size divided by the minor axis of the secondary.
eg. 10" primary with a 2" secondary has a CO of 20%.
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But I would like to add, get a second smaller scope as well for when you can't be botherd setting up a large instrument.
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Good advice. In fact I wouldnt recommend a 16" of this type as an only scope unless you live in a good dark sky location and never want to shift it.