Home > Astronomical Telescopes > Skywatcher > Dobsonian Series
Model: 10256Brand: Skywatcher
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508MM (20”) F/4 PARABOLIC TRUSS TUBE COMPUTERISED GO-TO DOBSONIAN
Sky-Watcher STARGATE Dobsonians with their huge light gathering capabilities provide the ultimate WOW factor experience for aficionados of visual astronomy, delivering outstanding performance on both Planetary and Deep-Sky objects. The elegant and rigid all metal truss tube design is easily transportable when unassembled, and can be assembled and ready for use in about 20 minutes. The mount provides motorised operation in both Alt and Azimuth axes, and can slew the telescope automatically to, and track over 42,900 night sky objects from the Synscan handset's extensive computerised database. Features Freedom-Find™ Dual-Encoder technology, which also allows the telescope to be moved manually in either axis without losing it's alignment or positional information, giving the user enormous convenience and flexibility during observing sessions. Simply push the telescope close to the object and let the computer do the rest of the work!
Magnifications (with Eyepieces supplied): x71 & x200Highest Practical Power (Potential): x1016Diameter of Primary Mirror: 508mmTelescope Focal Length: 2000mm (f/4)Eyepieces Supplied: 10mm (1.25") & 28mm (2”)Collimating Eyepiece (1.25")Dual-Speed 2" Crayford Focuser with 1.25” adaptorParabolic Primary Mirror (Patented weight saving design)136mm Secondary Mirror9x50 FinderscopeDirect SLR Camera ConnectionFabric Light ShroudAlt-Azimuth Go-To mount (Metal construction)Transmission: Worm + Timing Belt + 64 Micro-step/0.9º Stepper Motor DrivePatented 'Freedom-Find' Dual-Encoder design allows manual movement without losing positional informationPointing Accuracy: Up to 5 arc-minutes (RMS)Gear Ratio: Azimuth 400, Altitude 1523.796Synscan Computerised Handset with 42,900+ Object DatabasePower requirement: DC11V/5A ~ 15V/3A61% more Light Gathering than 400mmOverall Weight 65kg PARABOLIC PRIMARY MIRRORSFeatures High Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal lengh reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, constrasty images, which are full of detail.
SKY-WATCHER DELUXE MIRROR COATINGSMost reflectors today usually have a coat of aluminium as the mirror surface and then an overcoat of silicon monoxide or silicon dioxide to protect it. Silicon dioxide produces a much more durable coat than silicon monoxide but requires specialized equipment to apply it and is therefore more expensive. Protection is needed, because in most reflectors, the mirror is open to the elements and deterioration of the reflective layer reduces the resolution of the telescope. ALL Sky-Watcher reflectors are Multi-Coated with Silicon Dioxide as standard for Optimum Durability and Long Term Performance.
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