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Well said Marc
I have been saying this for years. The corrector plates primary task is to correct spherical aberation that occurs quite severely with the fast mirrors used in SCT's. To correct this problem the corrector plate progressively from the centre alters the angle of incident wave on the edge of the mirror to make the mirror work like a parabola.
If it is not precisely located (centered) it won't do its job.
Any other corrector device used in the optical path must also be correctly positioned at its design location to be effective.
Barry
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