Step up to to the Sky-Watcher 10" Dobsonian for extra light gathering and sharper observing! Most Practical f/5 Telescope Outstanding Light Gathering Ability Super-smooth Azimuth Movement Tension Control System 2″ Focuser with a 1.25″ Adaptor 5 Years Sky-Watcher Limited Warranty The Ultimate Light Gatherers The Dobsonian telescopes are named after John Dobson, an amateur astronomer who designed a very simple but effective telescope, where the key factor is a large aperture for little money. His idea was to mount a Newton telescope on an easy-to-use alt-azimuth mount that does not need time-consuming alignments. The Sky-Watcher 10″ Dobsonian is a large aperture Newtonian reflector telescope with f/5 focal ratio, make it ideal for wide field and deep-sky observation. Big aperture means better light gathering power and with this Sky-Watcher Telescope you are able to see prominent deep-sky object such as nebulae, star cluster and many more. It's also an excellent telescope for viewing planets such as Jupiter, Saturn and its rings and more. To top it off, the Sky-Watcher Classic 250P Dobsonian is equipped with a 2″ Crayford focuser and focuser locking screw to allow easy use of either eyepiece size. Tension Control SystemThe Tension Control System allows you to adjust the friction setting; to increase or reduce the amount of resistance when moving the tube on the wooden mount, so you always have the appropriate resistance. The secret of the design is to correctly balance the optical tube with the specially designed handles (found on the base) and this adds enough friction and tension to allow the tube to move easily when nudged or to stay solidly in position. In The Box: Finderscope 6X30 straight version Eyepiece 1.25″ 20mm (60x) – apparent field of view 70° Eyepiece 1.25″ 12.5mm (96x) – apparent field of view 70° Eyepiece adaptor from 2″ to 1.25″ with M42 thread 2″ Tube Extension User Manual Specifications Model SWDOB250 Optical Design Newtonian (parabolic primary mirror) Aperture 250mm Focal Length 1200mm Focal Ratio f/5 Resolving Power 0.60" Stellar Limit Magnitude 12.9 Highest Practical Magnification 400X Light Gathering Power (vs unaided eye) 816 Focuser 2" Crayford with 1.25" adaptor
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