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but low profile would be ideal as I can then keep the secondary optimally small and not too big.
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Is this for photography? If so, you won't need what I would define as "low profile" - the distance from the OTA wall to the CCD chip will be determined by the length of the corrector. If you start with this measurement, the others will fall into place. Ideally you want the end of the corrector at the OTA wall. If it's too low profile, the corrector will protrude inside the OTA.
Hope this make sense.
James