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User Manual for Sky-Watcher Stargate 18" f 4.2 Truss-Tube AZ Dobsonian Telescope Click to enlarge the picture
Contents of the user manual for the Sky-Watcher Stargate 18" f 4.2 Truss-Tube
- Product category: Reflectors Sky-Watcher
- Brand: Sky-Watcher
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Sky-Watcher Reflectors
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User manual for the Sky-Watcher Stargate 18" f 4.2 Truss-Tube contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Sky-Watcher product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Sky-Watcher user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Sky-Watcher product will considerably shorten its lifespan!
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Product description With the extremely large light bucket users have come to expect from a Dob, the Sky-Watcher Stargate 18" f/4.2 Truss-Tube Dobsonian Telescope gives users exceptional performance with a low dollar-to-aperture cost. Proprietary aluminum mirror coatings ensure maximum reflectivity, and a fused conical parabolic primary mirror design allows for thinner mirror construction. This provides faster cooling and lighter weight while also correcting spherical aberration to eliminate distortion across the entire field of view, especially at the edges.This telescope's large 18" aperture draws in a tremendous amount of light to reveal awe-inspiring details of the Moon and planets. Deep-sky objects will be visible even for inexperienced observers and bright star clusters can be resolved to their core. Its f/4.2 focal ratio and dual-speed Crayford focuser make this an ideal choice for imaging. The fast focal ratio enables devices to capture images in less time than slower scopes, while the focusing mechanism gives it the ability to achieve tack-sharp focusing with zero backlash that rack-and-pinion focusers are generally unable to accomplish. This 2" focuser will accept larger eyepieces so users can enjoy a truly immersive visual experience and will ensure larger imaging sensors are completely covered.Its truss-tube construction and simple assembly enable a virtually complete breakdown for easier transportation and storage, with an assembly time of less than 20 minutes. To help block stray peripheral light and internal reflected light, Sky-Watcher includes a ribbed fabric shroud that completely covers the open trusses, giving users the convenience of the truss system with the performance of traditional solid tubes. The rocker box weighs in at 62 pounds and provides a rock-steady observational platform with very low vibration. - Optical Tube
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- 18" (457.2mm) aperture
- f/4.2 focal ratio
- 1900mm effective focal length
- Dobsonian reflector light path
- Fused borosilicate mirror glass allows for thinner mirrors that reduce weight and increase cooling
- Highly reflective aluminum mirror coatings
- 120mm secondary mirror, 7% obstruction by area
- Resolution: 0.31 (Rayleigh); 0.25 (Dawes)
- Dual-speed Crayford-style focuser enables more precise focusing than conventional rack-and-pinion without backlash
- Max eyepiece height: 74.5" (189.2 cm), when OTA is pointed at the zenith
- Open truss tube design allows for easier breakdown and transportation, with reduced weight versus solid tubes
- Mount
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- Manual alt-azimuth
- Steel and Teflon azimuth and altitude bearings enable smooth movement with limited vibrations
- Floor standing with adjustable feet for proper leveling
- Included three 2.3-pound (1kg) counterweights enable precise balancing, especially when using accessories such as heavy eyepieces or imaging rigs
- Weight: 129 pounds, fully assembled with counterweights
- Included Accessories
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Eyepiece:- 1.25" 10mm eyepiece yields 190x power, accepts most 1.25" astronomical filters
- 2" long eye relief 28mm eyepiece produces 68x magnification, accepts most 2" astronomical filters
- 1.25" collimation eyepiece enables the user to properly collimate the primary and secondary mirrors
- 2"-to-1.25" reducer adapter allows the use of smaller eyepieces and accessories in the larger drawtube
Finder:- 9x magnification ensures a wide field of view for faster alignment and easier star-hopping navigation
- Large 50mm objective enables it to resolve dimmer objects
Shroud:- Covers the open portion of the truss assembly
- Ribbed fabric absorbs internal reflected light
- Blocks peripheral exterior and reflected interior light which can interfere with light transmission to the mirrors
- Helps to produce higher contrast views and sharper images during astrophotography
UPC: 050234119009 In the Box Sky-Watcher Stargate 18" f/4.2 Truss-Tube AZ Dobsonian Telescope 9x50 Finderscope 2" 28mm Eyepiece 1.25 " 10mm Eyepiece 1.25" Collimation Eyepiece Eyepiece Reducer Adapter Ribbed Fabric Shroud 3 x 2.3-lb Counterweights Limited 2-Year Warranty Table of Contents
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Technical parametersSky-Watcher Stargate Specs | Optical Design | Dobsonian reflector | | Aperture | 18" / 457.2mm | | Focal Length | 1900 mm | | Focal Ratio | f/4.15 | | Eyepiece Barrel Diameter | 2"
1.25" with included adapter | | Diagonal | None | | Finderscope | 9 x 50 | | Tripod | None | | Mount Type | Floor-mounted manual alt-az | | Power Source | None | | Optical Tube Dimensions | Height: 80.7" / 205.0 cm
Horizontal radius: 57.1" / 145.0 cm
Base diameter: 23.2" / 59.0 cm | | Weight | Upper Cage: 11.0 lb / 5.0 kg
Truss Poles: 16.0 lb / 7.3 kg, total; 2.6 lb / 1.2 kg, each
Mirror Box: 62.0 lb / 28.1 kg
Dobsonian Base: 40.0 lb / 18.1 kg
Fully Assembled: 129.0 lb / 58.5 kg, with weights | | | | Package Weight | 202.55 lb | | Box Dimensions (LxWxH) | 42.3 x 38.0 x 29.0" |
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