Orion‘s 10″ and 12” f/8 Orion Ritchey-Chrétien Astrograph Truss Tube Telescopes feature premium quartz mirror optics in its hyperbolic primary and secondary to achieve flat images that are virtually free of chromatic aberration, for true-color performance. Each of the Orion Ritchey-Chrétien Astrograph Truss Tube Telescopes primary mirror and the secondary […]