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Any triangulation you see at prime focus should be seen easily visually at high power but close to focus - don't rack a star out of focus to fill 1/3 of the field at high power and expect to see triangulation - only 5 waves or so of defocus will show the triangulation visually ( 5 dark Fresnel rings in the out of focus star ) ...
Its possible of course that the triangular pinch appearance is actually in the polished surface , but silicone has incredible power to warp optics if not done properly so we would hope it is the silicone.
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