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Another thing, you will need to lengthen the distance between your primary and spider/focuser/imagining plane by an equivalent distance as from the secondary across to your imaging plane, possibly somewhere around 6-12" depending on the size of your primary and the focal plane point.
I suppose it all comes down to, what are you going to gain by doing it?
Seems like a lot of work and cost, for the gains you "might" achieve.
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