1.25 inch calibration eyepiece is of short size, made from aluminum alloy and finished by CNC manufacturing Make sure the black spot is in the center of 2 lines of collimation eyepiece Used to calibrate the optical of a refractor, put the collimation eyepiecre into the tube Please adjust the screws if it is not in the center, in this way, you will collimate sucessfully A wonderful accessory for both photography and astronomy lovers
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