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One advantage of the design, which I haven't heard mentioned, is that it may be ideal for binoviewers. It should be possible to vary the strut length in order to use a binoviewer without an OCA.

Joseph

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that's a very interesting thought, Joseph! the only issue I could foresee about this is that the light cone would change, so the illumination of the secondary would be affected, which could effect the use of a binoviewer. maybe EdZ will see this comment of yours and weigh in on it's merits or lack therein.