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[ATM] Cassegrain Secondary Magnification

Hi,

I am trying to design a short tube, long focal length cassegrain (planetary
scope) and would like to know what are the disadvanteges of having high
secondary magnification factor. For example what would be the disadvantage
of having an F1.5 mirror in an F15 cassegrain (10x secondary magnification)?
I do realize that an F1.5 parabolic primary is a challenge. Anyone care to
comment.

Regards,

Alfredo


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