SkyWatcher 508/2000 DOB 20 GOTO telescope Sky-Watcher telescopes opinie

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This is the world's largest mass-produced telescope for visual observations!

Sky-Watcher Dobson 20" is an Ultra-Light truss Dobsonian with a parabolic mirror with a diameter of 508 mm and an aperture of f/3.9. Despite its large size, its transport is not a problem at all, thanks to the possibility of disassembling the telescope into parts. It is impressive that this powerful telescope can be assembled individually and packed into a small sedan or hatchback and left the city under the dark sky! A huge, 20-inch mirror provides an extraordinary visual experience, which will be enhanced by the dark sky, away from pollution and city lights.

Innovative design

Sky-Watcher has taken a completely new path when designing the new Dosbona 20”. The modern art of creating modern telescopes, inspired by the great Dobsonians from the USA, resulted in a well-thought-out design. When building the Sky-Watcher prototype, he consulted with the greatest specialists from the USA, including: with Howie Glatter and Don Pensack. Instead of large and massive chipboards, a numerically calculated light frame was used, constituting the main mirror cage and a lattice made of tubes that can be disassembled into two parts so that the tubes forming it are as short as possible during transport. The secondary mirror cage has a symbolic form - it helps keep the center of gravity at a low height, so the height of the base is minimal. Great importance was attached to reducing the height of the lift when observing at the zenith, most of the time the observer can observe from the ground. Instead of a standard bearing, wide skids are used in the height axis to improve the stability of the telescope when the lift is loaded with 2-inch glasses weighing up to 1 kg.

Go-To system

The telescope is equipped with a Go-To system that allows you to automatically find and track thousands of objects. Thanks to precise stepper motors, the comfort of observation is greatly improved. This is a completely different class of drive than the one used in other Dobsonian telescopes, with a precision equal to that of the professional EQ8 equatorial mount. Objects can be selected from a list using the remote control, and the telescope can be precisely positioned using electronic micro-movements. Thanks to dual axis encoders and removable axis locks, you can rotate the telescope by hand without losing tracking. After focusing on a new object, the telescope automatically starts to follow its movement. The ALT axle drive on a steel cable and gears on toothed belts ensure almost no play!

The Go-To system, thanks to its precision, is perfect for planetary photography using a simple camera or specialized CCD cameras. In addition, the object tracking system will allow you to perform short-term exposures of deep sky objects and transmit high-quality HD images live to the monitor screen for educational and demonstration purposes, after equipping the telescope with an appropriate CCD camera.

Advanced optics

The heart of the telescope is equally innovative. The parabolic main mirror with a diameter of 508 mm and a focal length of 2000 mm is made using an innovative technique - the Pyrex blank is made in the form of a ribbed cone, reducing its weight and heat capacity. Together with the open structure of the mirror mounting, allowing free air flow, achieving its thermal balance with the surroundings was significantly accelerated. The mirror is permanently mounted in a way known from the 16" Dobsonian, which protects it against accidental falling out and makes it easier to keep the mirror collimated and clean if you want to clean it. Teflon sliding bearings guarantee lightness and unrivaled smoothness of movements in both axes, making manual guidance possible even at magnifications exceeding 300x.

Incredible range and quality of observations

The optical parameters of this giant are as amazing as its construction. The collecting capacity with this aperture is more than five times greater than what can be obtained from the popular 8-inch Synta, and the collecting area is 56.5% larger than in the previously largest Dobsonian model with an aperture of 16 inches. The stellar range, expressed in magnitude units, is about magnitude 9. larger than for the unaided eye, making stars and asteroids up to magnitude 17. can be visible in this telescope. This means that the brightness and sharpness of the images are impressive, and with a good eyepiece, in a dark sky, the views of nebulae, galaxies and planets are breathtaking and resemble photos from the Internet. Powerful magnifications of up to 500x are possible, and the image quality is limited only by weather conditions.

New possibilities in the world of large Dobsonian telescopes

Finally, and it is worth mentioning, the new Dobsonian telescope produced by Sky-Watcher has a chance to reach completely new circles of recipients thanks to its unrivaled combination of compact design, mobility and monstrous aperture. Anyone who dreamed of a 16" Dobsonian and was afraid of its large dimensions should look forward to the first copies of the new telescopes.

Recommended accessories

Due to the significant aperture of this telescope, amounting to f/3.9, we strongly encourage you to use high-class glasses that can cope well with such a steep cone of light coming from the fast, parabolic mirror. . The best examples are Tele Vue Nagler, Delos or Ethos glasses, Vixen LVW glasses, Pentax XW series, or Morpheus from Badeer. They are very good partners for such a large mirror and a perfect complement to the optical path of this unique telescope. Due to the coma phenomenon, it is worth equipping this telescope with a coma corrector - both for astrophotography and visual observations. We also recommend using UHC nebular filters and other filters, especially narrowband filters such as OIII or H-beta. They will perfectly isolate areas of hydrogen or oxygen emission, especially the OIII filter in combination with high magnification when observing planetary nebulae.

Technical parameters

• optical system: Newton's reflector
• Mirror diameter: 508 mm
• lens focal length: 2000 mm
• Light intensity: 1/3.9
• Diameter of the elliptical secondary mirror: 136 mm
• theoretical angular resolution: 0.28"
• maximum useful magnification: 762x
• telescope weight: 65 kg

Equipment

• telescope with Dobsonian mount
• collimation eyepiece
• eyepiece: LET 28 mm (71x magnification), SP 10 mm (200x magnification)
• primary and secondary mirror covers
• eyepiece reduction: 2" / 1.25"
• sliding light cover
• 9x50 optical finder

Guarantee

60 months (5 years) for mechanics and 2 years for electronics (manufacturer's warranty)