Sky-Watcher brings to you the ultimate DOB experience with the StarGate 18 Dobsonian! Given its remarkable light gathering power, you will be able to catch the most subtle night sky features with your naked eyes. The sturdy giant is reasonably light (110Lb) despite its dimensions, and being easily assembled (30-minute setup time), the whole scope boasts remarkable transportability. If you have the appetite for exceptional planetary and deep space observation, then don't miss out on this high-quality Newtonian system. PARABOLIC PRIMARY MIRRORS Features High-Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal length reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, contrasty images, which are full of detail.

Newtonian Reflector Aperture: 458 mm (18'') Focal Length: 1900 mm (74.8 in) Focal Ratio: f4 Light Gathering Power: 4266x High quality/precision parabolic mirror Low-expansion borosilicate glass for both primary mirror & secondary mirror For visual observing up to 914x practical magnification (Lowest Useful magnification 65x) 0.25-arc second resolving power (Dawes) and 0.28 arc seconds resolving power (Rayleigh) & 16 stellar magnitude Optical Tube Length: 1940 mm (76.4 in)

See a new review of this model at http://skywatcher.com/post/review/sky-watchers-stargate-18-inch-dobsonian-review-sky-telescope-2018-april-issue/