Major axis of secondary mirror: 56., 5mm , minor axis: 40mm The Maksutov-Newtonian Telescope: discussion, survey and an image of the 10 day old Moon - Professor Morison's Astronomy Digest Astronomical Optics Replacement Ota Primary Mirror Altazimuth-mounted Newtonian Telescope Dobsonian 203mm Telescope Primary Mirror The 203mm aperture allows for enhanced light gathering, offering clearer, brighter images of celestial objects compared to smaller telescopes. Long Focal Length Caliber: 203mm, Focal length: 1600mm , Surface accuracy： 1/10 λ This is a primary mirror set for an 8-inch (203mm) Newtonian reflector telescope. The primary mirror is spherical with a focal length of 1600mm, giving you a focal ratio of f/8, which is a great all-around choice for viewing planets and deep-sky objects D203F1600 Mirror for Newtonian Reflector Astronomical Telescope Specification:Primary mirror: sphericalCaliber: 203mmFocal length: 1600mmThe thickness is about 18mm Reflected at: 92%Major axis of secondary mirror: 56., 5mm Minor mirror minor axis: 40mm Coating, aluminizing and protective filmPackage description:1 D203F1600 mirror1 40mm second mirror1 packing box
