Sky-watcher Equinox-100 Pro Fluorite Ed Apochromatic Refractor Ota
Sky-Watcher Equinox-100 PRO 100mm (4") f/900 Fluorite ED Apochromatic Refractor Optical Tube Assembly. The exquisite State-Of-The-Art Optics as used in the Evostar-ED PRO models are now housed in tube assemblies of even higher quality.The Tubes are Precision CNC machined & Hard Anodized. These are exceptionally high Performance telescopes for Planetary and wide field Deep-sky observations. Built with two-element multi-coated air-spaced objectives, the second element is made of the highest-grade extra-low dispersion (ED) Japanese Fluorite glass.Extra-low Dispersion glass allows the optical designer to virtually eliminate chromatic aberration (false colour fringing around bright objects), which results in higher resolution and superior contrast in the images.Each objective lens is finished by hand by skilled opticians and the quality of each telescope is monitored by means of a Ronchi test and an Artificial Star Test. No effort is spared to reach optimal optical quality.