Sky-Watcher N-254/1200 SYNTA 10" DOBSON Pyrex telescope (Dob 10" Classic 250P) (Sky-Watcher, SKU: SW-1303) is a large Newtonian reflector telescope with a 254 mm aperture and a focal length of 1200 mm, mounted on a stable Dobsonian base. The large mirror diameter makes the instrument particularly suitable for visual observations of deep-sky objects, while also allowing detailed observations of the Moon and planets.
The telescope allows you to observe open and globular clusters, nebulae, galaxies and supernova remnants. Under dark skies, all Messier objects and numerous objects from the NGC and IC catalogues are within the instrument's reach. The level of visible detail depends on observing conditions, collimation accuracy and the degree of light pollution.
Within the Solar System, the telescope allows you to observe details on the lunar surface, the phases of Mercury and Venus, the polar caps and basic surface features of Mars, Jupiter's atmospheric belts, transits of its moons, Saturn's rings with the Cassini Division, as well as the discs of Uranus and Neptune. Near the full Moon, it is worth using an optional neutral-density lunar filter to reduce image brightness and improve observing comfort.
The 254 mm mirror collects approximately 1317 times more light than the human eye and around 56% more light than a 203 mm mirror. This makes it possible to see fainter objects and more easily identify details in clusters, nebulae and brighter galaxies.
The primary mirror is made of Pyrex borosilicate glass with a low coefficient of thermal expansion. This material limits changes in the shape of the mirror as the temperature changes, helping to maintain stable optical performance.
The f/4.8 focal ratio is well suited to observations of extended deep-sky objects. The telescope is equipped with a 2" Crayford focuser with adapters for 2" and 1.25" accessories, as well as a 9 × 50 optical finderscope with crosshairs.
The Dobsonian mount is a simple alt-azimuth design intended primarily for visual observations. It is operated manually in two axes: azimuth, meaning horizontally, and altitude, meaning vertically.
• Newtonian reflector telescope with a 254 mm aperture
• parabolic primary mirror made of Pyrex glass
• 1200 mm focal length and f/4.8 focal ratio
• manual Dobsonian alt-azimuth mount
• 2" Crayford focuser with a 1.25" adapter
• 9 × 50 optical finderscope with crosshairs
• two wide-angle eyepieces with a 70° field of view
• adapter for attaching a smartphone
• Sky-Watcher 254/1200 mm optical tube
• Dobsonian mount
• focuser adapter/extension tube for 2" accessories
• focuser adapter/reducer for 1.25" accessories
• 9 × 50 finderscope with crosshairs
• 12.5 mm Wide Angle 70° eyepiece
• 20 mm Wide Angle 70° eyepiece
• smartphone adapter
• optical system: Newtonian reflector
• primary mirror type: parabolic
• primary mirror diameter: 254 mm
• primary mirror material: Pyrex glass
• focal length: 1200 mm
• focal ratio: f/4.8
• secondary mirror diameter: 58 mm
• stellar limiting magnitude: 14.6 mag
• maximum useful magnification: 508×
• resolving power according to the Rayleigh criterion: 0.56"
• resolving power according to the Dawes criterion: 0.46"
• light-gathering power: 1317×
• mount type: Dobsonian alt-azimuth mount
• mount control: manual
• focuser type: Crayford
• focuser diameter: 2"
• focuser adapter: 2"/1.25"
• focuser fine adjustment: no
• optical tube length: 1130 mm
• optical tube diameter: 290 mm
• optical tube weight: 13 kg
• mount weight: 12 kg
• total weight: 25 kg
Moon
planets
star clusters
nebulae
aircraft
• manufacturer's warranty period: 60 months
The large aperture, stable Dobsonian mount and included wide-angle eyepieces create a set designed for convenient observations of the Moon, planets and numerous deep-sky objects.
