POFET 1.25 inch Calibration Eyepiece, Astronomical Telescope Eyepiece Optical Suitable for Refracting Telescope

• 1.25 inch calibration eyepiece is of short size, made from aluminum alloy and finished by CNC manufacturing.
• Used to calibrate the optical axis of a refractor, put the collimation eyepiecre into the tube.
• Make sure the black spot is in the center of 2 lines of collimation eyepiece.
• Has a 45 degree plate for easier visual accuracy. Collimation is the alignment of elements inside an optical system like a telescope.
• Suitable for refracting telescope

1.25 inch Calibration Eyepiece, Astronomical Telescope Eyepiece Optical Suitable for Refracting Telescope Product Description: 1.25 inch calibration eyepiece is of short size, made from aluminum alloy and finished by CNC manufacturing. Used to calibrate the optical axis of a refractor, put the collimation eyepiecre into the tube. Make sure the black spot is in the center of 2 lines of collimation eyepiece. Has a 45 degree plate for easier visual accuracy. Collimation is the alignment of elements inside an optical system like a telescope. Specifications: Condition: Brand New Material: Aluminium Alloy Color: Black Caliber Diameter: 1.25in length: Approx. 64 mm / 2.52 in Diameter: Approx. 35 mm / 1.38 in Weight: Approx. 92 g Package List: 1 * Eyepiece