Optical system: Newtonian reflection Caliber: 114mm Focal length: 900mm Focus ratio: 7.89 Eyepiece 1: 20mm Magnification 1:45 x Eyepiece 2: 4mm Magnification 2: 225 x Barro lens: 3 x (Is this thereI don't think it is, the tube is so long, or it is an external Barrow.) Finder mirror: 5 x24 Base: equatorial Tripod: aluminum Accessory tray: no need to install tools / eyepiece support CD ROM: The Sky X Planetary Software Total weight: 8.62kg Limit star: 12.8 Resolution (Rayleigh limit): 1.22 arc seconds Resolution (Du's limit): 1.02 angular seconds Photo resolution: 253 strips / mm Light collection: 265x Field of view: 0.9 Linear field of view (1000 yards): 14.63m Optical coating: aluminum film Secondary mirror occlusion: 25.4mm Secondary mirror area occlusion ratio: 5% Secondary mirror diameter occlusion ratio: 22.3% Main barrel length: 863.6mm