Celestron EdgeHD 11"" - General Features * 11"" EdgeHD Optical Tube Assembly * Aluminum Optical Tube * Celestron"s premium StarBright XLT coatings * 2800mm focal length (f/10) * 23mm Axiom 2"" eyepiece included (102x) * 9x50 finderscope to help accurately find objects * 2"" diagonal provides more comfortable viewing position when observing objects that are high in the sky * Mirror Support Knobs hold the mirror in place and reduces image shift during imaging * Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror * Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging * Includes dovetail rail compatible with CGE mount Specifications * Optical Design : Aplanatic Schmidt * Aperture : 279.4 mm (11 in) * Focal Length : 2800 mm (110.24 in) * Focal Ratio : f/10 * Finderscope : 9x50 * Optical Tube : Aluminum * Eyepiece 1 : 40 mm (1.57 in) * Magnification 1 : 70 x * Star Diagonal : 1.25 * Optical Coatings : StarBright * Secondary Mirror Obstruction : 3.75 in (95.25 mm) * Secondary Mirror Obstruction by Area : 11.6 % * Secondary Mirror Obstruction by Diameter : 34.1 % * Optical Tube Length : 24 in (609.6 mm) * Optical Tube Weight : 28 lb (12.7 kg) * Dovetail Compatibility : CGE Mount/ Orange * 10% INSTANT SAVINGS! REGULAR $3399 SALE ENDS 8/31 * State of the art 11-inch EdgeHD aluminum optical tube * 2800mm focal length and 70x mag.; 9x50 finderscope * Removable secondary mirror for fast f/2 ccd imaging * 22mm Axiom 2 eyepiece with enhanced light transmission