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