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Levenhuk Ra 250N Dobson Telescope

Levenhuk
Newtonian telescope with a built-in primary mirror cooling fan. Aperture: 250mm. Focal length: 1250mm
  • Category: Telescope
  • Product ID: 50749
  • Country: PRC, controlled by Levenhuk, Inc. (USA)
  • Warranty: lifetime
  • Shipping weight: 86.3 lb (39.12 kg)
  • Package size (LxWxH): 55.5×22.4×19.5 in (141×57×49.5 cm)
  • Out of stock
  Levenhuk Ra 250N Dobson is a Newtonian reflector with a 250mm diameter primary mirror. Its optics allow for observing thousands of deep-sky objects in detail that cannot be observed with small-aperture telescopes. You can also use this telescope for outer space exploration. For example, you can observe small structures on Mars’s surface, details in... more

Levenhuk Ra 250N Dobson is a Newtonian reflector with a 250mm diameter primary mirror. Its optics allow for observing thousands of deep-sky objects in detail that cannot be observed with small-aperture telescopes. You can also use this telescope for outer space exploration. For example, you can observe small structures on Mars’s surface, details in the atmosphere of Jupiter, the Encke gap within Saturn’s rings, and even a satellite of Neptune, Triton. It is an excellent optical instrument for visual observations of space that is best suited for trips to the countryside.

Parabolic primary mirror with active cooling of the optics

The parabolic primary mirror creates a clear image free from optical distortion, even at extreme magnification. Its surface is covered with an aluminum coating that reflects 92~96% of light improving image quality. Due to the dual-speed Crayford focuser, the focus can be smoothly adjusted.

The primary mirror features a cooling system that runs on batteries (purchased separately). If any telescope is moved from a warm room to a cold street and vice versa, the optics will take several hours to “cool down”. The built-in fan speeds up temperature stabilization almost twofold.

Stable and reliable Dobsonian mount with a brake system side bearing for smooth tube movement

The Dobsonian mount is easy to assemble and handle. It reliably holds the optical tube and allows you to carry out long-term observations with maximum comfort. The mount mechanics has been improved. Now, the movement of the tube is smooth so that tracking objects at high magnification is much more comfortable.

A special brake system side bearing for smooth tube movement allows you to move the optical tube a few centimeters up or down. There are scales on the mount sides for convenient balancing. In addition, the bearings have a more robust design (compared to conventional ones), and so they will run smoothly throughout their entire service life.

Quick start kit

The telescope kit includes base accessories that allow you to start observations right away. 9mm and 30mm eyepieces are ideal for your first introduction to deep space. An 8x50mm optical finder is used to search for objects.

Features:

  • Reflector with a high aperture, ideal for deep space observations
  • Parabolic primary mirror - no distortion even at extreme magnification
  • Special aluminum coating with a reflectivity index of 92~96%
  • Active cooling of optics for faster temperature stabilization
  • User-friendly and easy-to-assemble Dobsonian-style mount
  • Dual-speed Crayford focuser, brake system side bearing for smooth tube movement

The kit includes:

  • Telescope optical tube
  • Dobsonian mount
  • Plössl 9mm eyepiece
  • Super View 30mm eyepiece
  • Finder 8x50mm
  • Finderscope base
  • Cooling fan
  • User manual and lifetime warranty

Optical design

Newtonian reflector

Optics material

BK-7 glass

Optics coating

aluminum

Primary mirror diameter (aperture), mm

250

Lens (mirror) shape

parabolic

Focal length, mm

1250

Highest practical power, x

508

Focal ratio

f/5

Resolution threshold, arcseconds

0.5

Limiting stellar magnitude

14.7

Eyepieces

Plössl 9mm (138x), Super View 30mm (41х)

Eyepiece barrel diameter

1.25/2

Finderscope

optical, 8x50 mm

Focuser

2'' dual-speed Crayford

Telescope control

manual

Mount

Dobsonian

Additionally

Primary mirror cooling fan

Operating temperature range, °C
°F

−5… +35

Power source

cooling fan: 6 AA batteries (not included)

Tube-mount assembly system

Brake system side bearing for smooth tube movement

Optical tube material

metal

Usage

General use product.
May be used by kids over 3 years old.

User level

expert

Observed objects

deep-sky objects

Levenhuk Review:

Here you can find a list of celestial objects you can see with this telescope.

Main features:

  • Built-in cooling fan for the primary mirror;
  • Easy-to-use Dobsonian mount;
  • High-quality BK-7 glass optics;
  • Dual-speed Crayford focuser that ensures maximum precision during focus adjustments.

The kit includes:

  • Levenhuk Ra 250N Dob Telescope optical tube (optical elements inside)
  • Dobsonian mount
  • Plössl 9 mm eyepiece
  • SuperView 30 mm eyepiece
  • 8x50 finder scope
  • Finder scope base
  • Cooling fan
  • User guide and lifetime warranty

You can find a review on Levenhuk Ra 250N Dob Telescope here.


Find out the names of the most interesting celestial objects to observe here and here.

There are no recent reviews available for this product.

Levenhuk Ra 250N Dobson Telescope - Total: 20 Negative 0 Positive 20


Ivan Ayers (2015-01-06 02:33): Positive
Does the difference in dimensions between Levenhuk Ra 300N Dob and Levenhuk Ra 250N Dob have any importance? Levenhuk Customer Service:
Levenhuk Ra 300N Dob Telescope features large objective lens diameter then Levenhuk Ra 250N Dob Telescope. Therefore, the maximum useful magnification of the first model will be higher.

Ivan Ayers (2014-12-10 09:29): Positive
Hello! Tell me please what is the objective lens diameter of this telescope? Is it 254mm or 250mm? Levenhuk Customer Service:
The objective lens diameter of the Levenhuk Ra 250N Dob telescope is 254mm.

Walter Carson (2014-09-10 06:58): Positive
Hello. Is it in stock? Levenhuk Customer Service:
Unfortunately this model is currently out of stock, we expect Levenhuk Ra 250N Dob to be back in stock in February, 2015. In the meantime please consider the Levenhuk Ra 300N Dob telescope: http://www.levenhuk.com/catalogue/telescopes/levenhuk-ra-300n-dob/

Bruce Hodge (2014-08-16 08:07): Positive
Hello, how is this model different than Levenhuk Ra 200N Dob (http://www.levenhuk.com/catalogue/telescopes/levenhuk-ra-200n-dob/)? Which one is better? Levenhuk Customer Service:
The main difference between Levenhuk Ra 250N Dob and Levenhuk Ra 200N Dob is primary mirror diameter (aperture). The Levenhuk Ra 250N Dob is a preferred choice due to larger primary mirror diameter.

Amy Larson (2014-08-08 02:44): Positive
Hello! I wanted to ask you which eyepiece would allow me to achieve the highest practical power of this telescope? Levenhuk Customer Service:
To achieve the highest practical power of the Levenhuk Ra 250N Dob telescope we recommend using 2.5 mm eyepiece. Unfortunately such accessory is unavailable in our store at the moment.

Ramon (2014-06-16 06:53): Positive
When will the telescope be in stock? Which similar models (not less than 250-300mm) would you recommend? Levenhuk Customer Service:
We expect it in September 2014. Please, take a look at Levenhuk Ra 300N Dob Telescope - http://www.levenhuk.com/catalogue/telescopes/levenhuk-ra-300n-dob/.

Warren Swanson (2014-06-11 09:14): Positive
Greetings! I bought this telescope, which eyepieces are better for planetary observations? Someone recommended me to buy wide-angle eyepieces... is it a good advice? Levenhuk Customer Service:
Yes, the use of wide-angle eyepieces is preferred.

Daniel (2014-06-09 05:28): Positive
I can see there is some kind of a cross inside the tube... will I see it when observing? Levenhuk Customer Service:
Don't worry, you won't see it, only high-quality image of observed object with no distortions.

Jeff Parker (2014-05-21 11:33): Positive
I apologize for this silly question, but why it is needed to cool the telescope mirror? Levenhuk Customer Service:
Cooling the telescope mirror significantly reduces time of optics thermal stabilization. Thanks to the built-in fan the primary mirror quickly reaches thermal equilibrium with the environment.

Tim Suarez (2014-04-11 07:13): Positive
Where can I fing user manual in english for this model? I haven't found it in the box. Levenhuk Customer Service:
You can download the user manual in the 'References and Downloads' section.

Randall (2014-02-26 06:55): Positive
Hi! What should I buy to use Canon EOS 600d camera with this telescope? Levenhuk Customer Service:
You need camera adapter. For instance Levenhuk 2x Barlow Lens with Camera Adapter: http://www.levenhuk.com/products/levenhuk-barlow-lens-2x-adapter/. T-ring for Canon cameras is also required.

Warren Mann (2014-02-13 11:01): Positive
what's the eyepiece to get the maximum magnification? Levenhuk Customer Service:
Please pay attention to Levenhuk Ra LER 3 mm Eyepiece: http://www.levenhuk.com/products/eyepiece-levenhuk-ra-ler-3/

Eric Chang (2014-02-02 12:48): Positive
Is it okay if I store this telescope in a larder where the temperature is the same as outdoors, what happens to the instrument in cold weather? Levenhuk Customer Service:
You can store Levenhuk Ra 250N Dob telescope in a larder, nothing bad will happen to it.

Yvonne Turner (2014-01-29 02:12): Positive
What are the telescope's dimensions? Levenhuk Customer Service:
The dimensions of the Levenhuk Ra 250N Dob telescope (LxWxH): 57.1?19.7?19.7 in.

Norman Merrill (2013-12-28 05:20): Positive
Hello! Tell me, please, which telescope is more suitable for observing the starry skies and terrestrial objects from the distance of 500 meters and more. It should have high focal ratio and of course wide field of view. The price range - 300-900$. and high-quality of course!!! Your help is really appreciated. Levenhuk Customer Service:
For your purposes refractors and catadioptric telescopes will suit greatly. Please consider this model: Levenhuk Strike 1000 PRO Telescope - http://www.levenhuk.com/products/telescope-levenhuk-strike-1000-pro/

Gary Palmer (2013-12-13 10:51): Positive
Hello! Which Barlow lens you would recommend me to buy additionally? How to achieve the maximum useful magnification? What objects can I observe at this magnification? Thank you. Levenhuk Customer Service:
To achieve the highest practical power we recommend you to use the eyepiece with 2.5 mm focal length. Barlow lenses in this case are not required. Here you can find a list of celestial objects you can see with a telescope based on its aperture - http://www.levenhuk.com/articles/things_you_can_see/

Dawn Sandoval (2013-11-14 05:45): Positive
Can I mount this telescope on Levenhuk Ra EQ5 GoTo? Or equip it with the auto guidance system somehow? Levenhuk Customer Service:
Levenhuk Ra 250N Dob telescope doesn't have fasteners required for it to be installed on Equatorial mounts. Currently we don't have motors for automatic guidance for dobsonian telescopes.

Irene Sherer (2013-09-03 01:21): Positive
Good evening! I don't understand anything in telescopes and astronomy, but I'm craving this telescope! I've been looking and comparing all day long and chose two models: this one and the Levenhuk SkyMatic 135 GTA. Which one would you recommend only for celestial observations (astrophotography is not needed), as I understand, with the first one I will be able to see more, but with the second - less, but without any problems. Levenhuk Customer Service:
The main advantage of Levenhuk Ra 250N Dob is larger objective lens diameter: the greater the aperture the more detailed images a telescope provides. On the other hand Levenhuk SkyMatic 135 GTA has an advanced auto guidance system, which with no doubt will be of a great help when navigating to and tracking celestial objects.

Gina (2013-05-31 01:20): Positive
Tell me, what filters are suitable for deep space observing? or I can use the ones you mentioned before? Levenhuk Customer Service:
For deep-sky observations we recommend: http://www.levenhuk.com/products/filter-levenhuk-ra-uhc-1-25/ http://www.levenhuk.com/products/filter-levenhuk-ra-o-iii-1-25/ http://www.levenhuk.com/products/filter-levenhuk-ra-h-beta-1-25/

Gina (2013-05-30 09:50): Positive
Hello! Tell me, what accessories should I buy with this telescope for observing planets, as well as deep-sky objects (including The Sun) so I wouldn't have any problems and I could get maximum satisfaction right away? Levenhuk Customer Service:
Please, pay attention to the following eyepieces: http://www.levenhuk.com/products/eyepiece-levenhuk-ra-ler-3/ http://www.levenhuk.com/products/eyepiece-levenhuk-ra-er20-wa-12/. The set of filters: http://www.levenhuk.com/products/com-filters_f4_solar_system_set/
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