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About this product
Command the night sky with monumental optical authority through a colossal 508 mm (20") aperture that pulls faint nebulae and intricate planetary surfaces into breathtaking clarity. Engineered for visual astronomers demanding peerless light collection, this instrument blends serious observatory-class light grasp with motorised SynScan tracking and a transportable modular structure.
508 mm Aperture
61% more light than 400 mm models
SynScan GoTo
Automated tracking of 42,900+ targets
Modular Truss
Rapid assembly in around 20 minutes
Freedom-Find™
Manual nudging without alignment loss
Exceptional Light-Gathering Performance
The foundation of the StarGate 500P is its massive 508 mm parabolic primary mirror, shaped precisely to direct all incoming rays to a common focal plane and eradicate spherical aberration. Protected by resilient silicon dioxide multi-coatings, the reflective surface resists environmental wear while yielding crisp, contrast-rich views across faint deep-sky clusters and crisp planetary features alike.
Effortless Navigation and Freedom-Find
Navigating the heavens is managed by the precision SynScan computerised handset, which commands dual-axis stepper drives to smoothly track more than 42,900 celestial bodies. Integrated Freedom-Find™ dual encoders let you aim the optical assembly by hand across either axis at any moment without compromising your electronic alignment or pointing accuracy.
Rigid Modular Architecture
Despite its substantial 90 kg total weight, the all-metal truss system disassembles swiftly for transit to dark-sky locations and can be fully rebuilt in approximately 20 minutes. The framework delivers high structural rigidity during observation while an included fabric shroud prevents stray peripheral light from reducing contrast at the eyepiece.
Silicon Dioxide Deluxe Mirror Coatings Every optical surface features durable silicon dioxide multi-coatings, providing tough defence against the outdoor elements and preserving peak optical resolution over years of field use.
Key Features
Massive 508 mm Parabolic Primary – Eliminates spherical aberration and gathers 61% more light than a 400 mm reflector for profound deep-space penetration.
SynScan GoTo System – Locates and tracks over 42,900 night-sky objects with pointing accuracy up to 5 arc-minutes RMS.
Patented Freedom-Find™ Technology – Dual-encoder design preserves your computerised star alignment even after manual pointing adjustments.
All-Metal Truss Tube – Combines rigid structural stability with a modular build that assembles in approximately 20 minutes.
Dual-Speed 50.8 mm (2") Crayford Focuser – Fine-tune critical focus smoothly with the micro-reduction drive, complete with a 31.7 mm (1.25") reducer.
Precision Motor Drives – Worm and timing belt transmission powered by 64 micro-step/0.9° stepper motors delivers smooth tracking without harsh vibration.
Specifications
Optical Design
Newtonian Reflector (Parabolic Primary)
Primary Mirror Diameter
508 mm (20")
Secondary Mirror Diameter
136 mm
Focal Length & Focal Ratio
2000 mm (f/4)
Highest Practical Power
1016x
Supplied Magnifications
71x & 200x
Mount Type
Alt-Azimuth GoTo (Metal Construction)
Drive Transmission
Worm + Timing Belt + 64 Micro-step/0.9° Stepper Motor
Gear Ratio
Azimuth: 400, Altitude: 1523.796
Pointing Accuracy
Up to 5 arc-minutes (RMS)
Handset Database
SynScan with 42,900+ celestial objects
Power Requirement
DC 11 V / 5 A to 15 V / 3 A
Total Weight
90 kg
What's in the Box
Sky-Watcher StarGate 500P Optical Truss Assembly
Motorised Alt-Azimuth GoTo Base
SynScan Handset with Cables
20 mm Wide-Angle Eyepiece (70°)
12.5 mm Wide-Angle Eyepiece (70°)
9x50 Finderscope
Dual-Speed 50.8 mm (2") Crayford Focuser with 31.7 mm (1.25") Adaptor