When it came I was somewhat amazed at its physical size. Even better performance for astro-photography and visual use can be achieved when used in combination with Sky-Watcher's Newtonian coma corrector (Prod.Code 20233) *Note: the Explorer-200PDS has a … It … As mentioned, the 200p is an 8 inch (hence 200 for 200mm) mirror, and its tube measures 920mm in length, its focal length is F/5. The Skywatcher Explorer 200p Telescope Tube. The Sky-Watcher Classic Dobsonian Telescope 203mm/1200mm (8") has a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with fine supports (0.5mm … The Sky-Watcher 200P / HEQ5 The Sky-Watcher 200 was ordered up and I settled back to wait for a delivery. Three huge cardboard packing … Even better performance for astro-photography and visual use can be achieved when used in combination with Sky-Watcher's Newtonian coma corrector (Prod.Code 20233) *Note: the Explorer-200PDS has a …