The Cassini C-900135TR telescope is mounted on Cassinis new Tracker altitude/azimuth mount. Its easy to use up and down, left and right movement allows tracking an object with unprecedented precision using both manual macro adjustments for aiming your telescope and manual micro adjustments for precise observing and tracking. The C-900135TR includes Cassinis sturdy, fully adjustable, pre-assembled metal tripod featuring an accessory tray with slots to place 4 1¼" eyepieces or lenses and retractable rubber feet. The C-900135TR optical tube assembly features a 900mm focal length. The large primary mirror is 135mm in diameter and in mounted in a heavy duty mirror cell with push / pull collimation screws. The finder is Cassinis Mars-Eye Electronic Finder which helps by getting the observer behind the telescope without losing the surrounding field of view when targeting objects. Included with the C-900135TR are a 1¼" 10mm Plössl eyepiece, a 1¼" 25mm Astroscopic Eyepiece, and a 2 element 3x Astroscopic Barlow. Lastly, the Cassini Stellarium CD ROM brings skies over your home or anywhere in the world. New Cassini TRACKER mount w/Slow Motion Vertical & Horizontal Manual Controls 900mm x 135mm Optical Tube Assembly Diffraction limited Optical Tube Assembly (λ4) Fully Adjustable Heavy Duty, Pre-assembled Metal Tripod w/Accessory Tray Cassini Mars Eye Electronic Finderscope 1¼" Helical Rack & Pinion Focusing 1¼" 10mm Plössl Eyepiece 1¼" 25mm Astroscopic Eyepiece 1¼" 3x 2-Element Astroscopic Barlow Cassini Stellarium CD-ROM One Year Limited Warranty