OTA · 1995–2002 Orion DSE 10 Dobsonian Orion Telescopes & Binoculars · DSE 10 Dobsonian Key specifications Aperture254 mm Focal length1143 mm Focal ratiof/4.5 Optical designNewtonian About 1990s 10-inch f/4.5 'Deep Space Explorer' Dobsonian reflector; precursor to the SkyQuest XT line.
