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Most likely the focal point is not far enough outside of the ota to reach prime focus at the focal plane of the camera.
You either need to replace the existing (rack and pinion ?) focusor with another with a lower profile (a crayford or a helical) or move the mirror up the tube an inch or 2.
Last edited by Ian Robinson; 29-05-2010 at 10:43 PM.
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