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CELESTRON CELESTAR 8 SCHMIDT-CASSEGRAIN TELESCOPE. EXCELLENT CONDITION. ONLY USED INDOORS. NEVER TAKEN OUTSIDE. TELESCOPE/WEDGE/TRIPOD AND MANUAL INCLUDED. UPGRADED OCULARS TO VIEW IMAGES UPRIGHT IN BOTH THE TELESCOPE AND FINDER SCOPE.
UPGRADED FINDER SCOPE. DEC MOTOR WITH FRESH 9V BATTERY INCLUDED. CELESTRON REDUCER/CORRECTOR (MODEL# 94175) INCLUDED. EXTRA EYEPIECES ALSO INCLUDED. FREE DELIVERY IN USA (LOWER 48). Celestron C-8 Optical Tube Assembly Specifications: Design Schmidt-Cassegrain Catadioptric Effective Aperture 8 inches, 203.2mm Nominal Focal Length 80.6 inches, 2048mm Nominal Focal Ratio f10 Primary Mirror 8.25" Diameter, f1.9, Radius 32", Spherical of fine annealed Pyrex® Secondary Mirror 2.25" Diameter, Radius 9.7, Spherical (final hand figuring yields a slight asphere) of fine annealed Pyrex® Mirror Coatings Celestron "Starbright®": 5 step multilayer Corrector Lens 8" Aperture, 0.190" thick, optical quality crown glass, true aspheric Schmidt curve each side, Mgf2 AR coatings each side Central Obstruction 2.75" Highest Useful Magnification Approx. 480x with eyepiece or "negative" lens/Eyepiece combination Lowest Typical Magnification 37x (1.34 degrees) with 2" 55mm Plossl (5.46mm Exit Pupil), or 32X (1.33 degrees) with 1.25" 40mm Plossl with f6.3 Reducer/Corrector (6.30mm Exit Pupil) Resolution, Visual Rayleigh Criterion: 0.68 arc seconds, Dawes Limit: 0.57 arc seconds Resolution, Film 182 lines per mm Image Scale (CCD or Film) 100 arc seconds per mm, 64 arc seconds per mm Light Gathering Power 843X Theoretical, Approx. 634X Actual over unaided human eye with 7mm entrance pupil. Back Focus 18 + or - 5 inches Optimum Back Focus Approx. 4 inches; with f6.3 Reducer/Corrector 4" from rear of Reducer Near Focus Approx. 25' (Camera or Visual) Optical Tube Dimension Length 16", Diameter 9", Front Cell Diameter 9-1/8" Optimum Back Focus Approx. 4 inches; with f6.3 Reducer/Corrector 4" from rear of Reducer Weight: Approx. 37 lbs. (telescope/wedge/tripod) |