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Hi Jethro, I was referring to the Farpoint autocollimator tool. Basically the same design as the Catseye one but not quite as precisely machined (at least mine does not seem to be) I was going by the title of your post. All the auto collimators I have seen are the same design - essentially a sight tube with a reflective surface under the pupil hole which allow more precise collimation of the secondary and primary by use of multiple reflections of the primary centre spot. Not to be confused with a simple sight tube and Cheshire.
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