Caliber: 60mm Focal length: 900mm Eyepiece: H20mm/H12.5mm/SR4mm Extender: 1.5x/3x Barov telephoto Finder mirror: 5x24 inverted image Zenith mirror: 90° right angle zenith mirror Theodolite: U-bracket Weight: 4.5kg Magnification: up to 675 times Focus ratio: 15 Light collection: 73x Field of view: 1.2° Linear field of view: 18m About the configuration: the focal length is 900mm, the caliber is 60mm, with 3 eyepieces: SR4 (for daytime viewing), H20 (for moon at night) and H12.5 (see other celestial bodies). In addition, it is equipped with a 3x Barov mirror and a 1.5x mirror. About multiples: separate eyepieces: SR4mm, H12.5mm, multiples of H20mm are: 900/4=225 times, 900/12.5=72 times, 900/20=45 times. Together with the 1.5x positive mirror, the imaging is a positive image, and the multiples are: 338 times, 108 times, 67.5 times. If you do not install a 1.5x mirror, but a 3x Barov mirror, the multiples are: 675 times, 216 times, 135 times. In other words, if we choose the eyepiece SR4mm, and then match the 3 times Barov mirror, then we can set up 675 times. Namely: magnification: 45 times - 675 times. Note: 3 eyepieces (SR4mm, H12.5mm, H20mm) can only be selected for one installation at a time, and 2 multipliers (3x Barov mirror 1.5x mirror) can only be selected at the same time.