ORION COLLIMATING EYEPIECE FOR ASTRONOMY TELESCOPES For Sale
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ORION COLLIMATING EYEPIECE FOR ASTRONOMY TELESCOPES:
Used Orion collimating eyepiece that looks like product number 13640, which was superseded by a nearly identical product, #04411, I paid $40. Commonly used in collimating Newtonian reflectors, also useful for aligning the focuser and cell of refractors.