Description: 1.25 inch calibration eyepiece is of long size, made of aluminum alloy. Used to calibrate the optical axis of a refractor, put the collimation eyepiecre into the tube. With a red crosshair for easy adjustment of collimation. The inner structure has light eliminating thread, can reduce light reflection to improve clearness of view. A wonderful accessory for both photography and astronomy lovers. Specification: Material: Aluminium Alloy Color: Black Caliber Diameter: 1.25 inch Suitable for Newtonian Telescope Size: Approx. 14.5 x 3.5cm / 5.7 x 1.4inch Weight: Approx. 197g Package Includes: 1 Piece Collimation Eyepiece Long Version
