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Old 10-10-2018, 07:05 PM
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RickS (Rick)
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Join Date: Apr 2010
Location: Brisbane
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At long focal lengths a guide scope is much less likely to perform well. It's not impossible to make one work, but it is difficult to reduce flexure sufficiently for good performance. Large primary mirrors that allow for a degree of movement, as has been mentioned, also don't mix well with guide scopes. If you lock the mirror in place then you are likely to cause other optical problems.

Cheers,
Rick.
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