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If the mirror clamps are too tight it causes astigmatism which shows up as severely distorted stars. As there are 3 clamps you will tend to get triangular stars. They will look horrible even when as precisely focussed as you can get, and defocused images look like misshapen triangles.
I cannot see how collimation would create this effect.
One possible way to test the EP would be place the image of Saturn nearer the edge of the field and rotate the EP and see if the "ghost" moves. If it moves I would think it would be a prob with the EP.
Malcolm
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