Sky-Watcher 203/1200 DOB 8 Pyrex telescope (aka Dob 8 Classic 200P) Dobsonians opinie

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Sky-Watcher 203/1200 DOB 8" Pyrex telescope (aka Dob 8" Classic 200P)

 
 
Availability: In stock, can be sent within 24 hours

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Sky-Watcher
 
484 EUR
price without VAT: 394 EUR

Sky-Watcher 203/1200 DOB 8\" Pyrex telescope (aka Dob 8\" Classic 200P)
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This telescope is ideal for observing nebular objects, open clusters, spherical clusters and a number of beautiful galaxies. The use of additional filters, especially the nebular filter, will allow us to further improve the image quality of nebulae, especially in places illuminated by artificial light. Please remember that all the planets of the solar system are within the telescope's range, as well as many of their moons, although the precision of guidance at high magnifications is lower than in telescopes with micro-movements.

The telescope also works perfectly when observing our natural satellite, although here, due to the amount of light entering near the full moon, it is worth using a lunar filter, preferably a neutral gray one ( neutral density ). The large, just over 20 cm long mirror collects over 800 times more light than the human eye.

The mirror is made of Pyrex glass, i.e. borosilicate glass consisting of 8% boron oxide and 85% silicon oxide. It is the admixture of boron oxide that makes the mirror slightly lighter and, above all, has a lower thermal expansion coefficient, which positively affects the quality of the obtained images.

Of course, although the size of the mirror is important, the telescope is also very well designed and equipped. Focal length 1200 mm, giving an aperture of f/6, excellent 2-inch Crayford focuser with reduction to 1.25", large finder scope 9x50, two wide-angle eyepieces 70° 1.25", 20 mm and 12.5 mm and intuitively simple Dobson azimuth mounting. The extractor has a T-2 thread that allows you to connect a SLR camera, allowing you to photograph bright objects (requires an appropriate reduction appropriate to your camera, i.e. Canon, Nikon, Sony Alfa, Pentax or Olympus).

The Dobsonian mount is the simplest and cheapest type of telescope mounting, which works very well for visual observations. The assembly is controlled by manually moving it in two axes, in the azimuth plane (horizontal) and in the height axis (vertical), which works well mainly at low and medium magnifications.

The telescope consists of an optical tube measuring 112 x 23 cm and weighing 8 kg and an azimuthal assembly weighing 12 kg. The telescope is originally packed in two boxes and is collimated and ready for observation after assembly.

In addition to astronomical observations, this telescope is great for observing and photographing aircraft at cruising altitudes.

THE OFFERED TELESCOPE ALLOWS YOU TO START OBSERVATIONS ON THE FIRST WEATHER NIGHT - IT CONTAINS ALL NECESSARY ACCESSORIES, THE OPTICAL TUBE OPTICS IS APPROPRIATELY ADJUSTED, THE SET INCLUDES GLASSES AND A DOBSON INSTALLATION


Usage

Moon
planets
star clusters
nebulae
planes




(complete Newtonian telescope mounted on a Dobson mount)









(primary mirror - rear view)







(Craford focuser and 9x60 finder)




(powerful mirror φ = 203 mm, spider with thin arms, secondary mirror)




(the set includes an adapter for glasses with a 2 inch / 50.8 mm frame)




(telescope base equipped with a shelf for accessories and a handle for carrying the box)












(Dobsonian installation - azimuthal - movement along the height axis is controlled by pressing handles on the side of the tube - in the photo a 6" telescope)


(rotation in azimuth, i.e. left - right; assembly mounted on Teflon washers - 6" telescope in the photo)

Technical parameters

• Optical system: Newton's reflector
• Mirror diameter: 203 mm
• Lens focal length: 1200mm
• Light power: 1/6
• Accuracy of the mirror: 1/8λ
• Mirror glass type: Pyrex
• Minimum useful magnification: 29x
• Maximum useful magnification: 400x
• Dimensions:
- Base diameter: 52 cm
- height of the base from the ground to the end of the side panels: 75 cm
- Outer diameter of the tube: 23 cm
- Internal diameter of the tube: 22 cm
- tube length: 110.5 cm
- eyepiece height with the tube set horizontally (h=0°): 83.5 cm
- eyepiece height with the tube set at 45°: 111 cm
- eyepiece height with the tube positioned vertically (h=90°): 116.5 cm
• Libra: 20kg

Equipment

The set includes the following accessories:

• Crayford focuser with a diameter of 2" with a 1.25" reduction and T2 thread
• 1.25" Wide Angle 70° glasses 20 mm (60x magnification) and 12.5 mm (96x magnification)
• Dobsonian assembly (azimuth box)
• 9x50 finder with a cross
• smartphone adapter
• optics covers

Guarantee

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

Attention!

This device focuses a large amount of light. Looking directly at the Sun through this device may result in partial or complete loss of vision. To observe the Sun, we recommend the safest method of eyepiece projection, i.e. projecting the image of the disk of our day star onto a piece of paper.

ADDITIONAL MATERIALS



READ : BEFORE YOU BUY A TELESCOPE - BUYER'S GUIDE
[PDF]


READ : SHORT GUIDE TO CLEANING OPTICS
[PDF]


READ : HOW TO CONNECT A COMPACT CAMERA WITH A TELESCOPE
[PDF]


READ : HOW TO CONNECT A DIGITAL SLR CAMERA WITH A TELESCOPE
[PDF]



>> FREQUENTLY ASKED QUESTIONS <<

Question : Is the base diameter really 52 cm?

Yes, we have measured many times (last time on February 19, 2021). The diameter of the base circle, including the widening, protective, black plastic tapes, in both 8" and 10" Sky-Watcher Dobsonians is 52 cm.

Question : Can a beginner cope with assembling and operating this telescope?

Answer: Each telescope is supplied with extensive instructions in Polish, from which the user will learn how to assemble the telescope and how to use it during observations. Customers usually have no difficulty assembling the telescope as long as they read the instructions.
A separate issue is searching for objects in the sky during the first observations. That's why we recommend educational items in the Publications section (especially maps and astronomical guides) and Stellarium: an excellent, free "planetarium" program in Polish, ideal for learning about the sky and planning observations.


GO AND DOWNLOAD STELLARIUM FOR FREE

Question : Can a DSLR camera be connected to this telescope? What accessories are needed for this?

Answer: Of course YES, you can connect a digital SLR camera to this, as well as to any other telescope. For this purpose, you need: a projection connector and a T2 ring appropriate for your SLR camera (there are 5 standards of SLR bayonets: Canon EOS, Nikon, Olympus E, Petax K and Sony Alfa / Minolta AF). These connectors are available in our online store in the astronomical accessories section.

Question : Can a compact camera be connected to this telescope? What accessories are needed for this?

Answer: Of course you can. You can find a suitable shelf for compact cameras in the astronomical accessories section of our online store ( universal adapter for compact digital cameras ).

Question : Can a HYBRID camera (a large compact camera with the dimensions of a SLR) be connected to this telescope? What accessories are needed for this?

Answer: You can try this, but it is not recommended. The so-called hybrids do not work well in astrophotography because they do not have the ability to remove the lens like an SLR camera, and they are large and have large lenses, which means that shelf systems cannot be used, and the vignetting is high because you cannot bring the objective lens very close to the last optical surface of the telescope eyepiece. We recommend purchasing a SLR camera or a cheap compact camera.

Question : What else is worth buying for this telescope?

Answer: The presented telescope is a complete set, ready to conduct astronomical observations on the first clear night. As an addition, we first recommend educational publications that will make both the use of the telescope and the observations themselves more conscious and easier. Additionally, it is worth considering purchasing contrast planetary filters and solar filter foils (available in the astronomical accessories section).

Question : Can this telescope be used as a viewing telescope/nature telescope?

Answer: NO. This (Newton) mirror telescope is not suitable for observing terrestrial objects because it produces an upside-down image ("green down") and there are no optically good ways to "restore" it. However, this does not interfere with astronomical observations, because for an Earth observer the concept of up and down makes sense on Earth, but does not exist in space.
However, the Newton system telescopes work quite well in photography of ground objects and observations of aircraft at cruising altitudes.

Question : Can I observe both planets and nebulas with this telescope? Is this a telescope only for the city or only for the countryside?

Answer: All offered telescopes allow you to observe the planets of the Solar System (all) and nebulae, or more precisely, galaxies, star clusters, emission nebulae, etc. A separate issue is the clarity of details of the planets' surfaces and the number and brightness of nebular objects. A smaller telescope has its own sky, a large one has its own, but we can always count on wonderful observations of the structures of the Moon's surface, the phases of Mercury and Venus, the disk of Mars, the belts on Jupiter and the four Galilean moons of Jupiter, the ring of Saturn and the disks of Uranus and Neptune. The brightest nebulae, such as the Great Andromeda Nebula M31, the Great Orion Nebula M42 or the globular cluster in Hercules M13 always delight, even a small telescope will reveal several dozen of the most beautiful nebulae. Finally, a telescope equipped with a solar filter can be used to observe spots on the Sun's disk.
There is no division into telescopes for the city and the countryside , but rather recommendations: if the telescope will be used mainly in the city, in conditions of urban light pollution and high atmospheric instability (buildings give off heat at night, heating the air and the image starts to "float" like on hot days over a hot road!), then an achromatic refractor (lens telescope) or Maksutov (meniscus-reflector) is recommended. Our target will be mainly planets and compact objects. In turn, under the pitch-black, rural sky, it is worth using a Newtonian telescope (mirror) with the largest possible mirror we can afford, because we can count on a more stable and transparent atmosphere and great opportunities to observe nebulae.

Question : Does this telescope come with a tripod/mount included?

Answer: Of course YES, every telescope has an assembly, unless it is described as OTA ( Optical Tube Assembly).

Question : You write that the telescope comes with an assembly, does this mean that you will come and assemble the telescope for me?

Answer: Mounting does not mean mounting , but the system of mounting the telescope tube. You need to understand that we never make hand-held observations with an astronomical telescope - we have to mount the telescope on a system that allows it to be precisely positioned in any part of the sky.
In the case of a Dobsonian mount , the optical tube of the telescope is mounted on a type of box that serves as an azimuth mount , i.e. having two perpendicular axes: a height axis ("up - down") and an azimuthal axis ("left - law").

Question : I see that this telescope is quite low. How/in what position is it observed?

Answer: Telescopes with a Dobson mount have an eyepiece - that is, the place where we look / "put our eye" - often relatively low, especially when the mirror diameter does not exceed 35 centimeters. Nevertheless, observation is possible in a standing position, and the most comfortable position is sitting - for this purpose, it is worth purchasing a height-adjustable stool or even a foldable fishing chair. The lying position is probably not practiced :-)


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