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Levenhuk Ra 250RC F8 OTA

Levenhuk
Ritchey-Chrétien. Objective lens diameter: 250 mm. Focal length: 2000 mm
  • Termékkód: 50752
  • Garancia: élettartamra szóló
  • Tömeg: 21,25 kg
  • Csomag méretei (HxSZxM): 88×44×42 cm
  Levenhuk Ra 250RC F8 OTA is a Ritchey-Chrétien telescope with an aperture of 250 mm (9.8 in) and a focal length of 2000 mm (78.7 in) in a traditional metal shell. This model is perfect for any keen astrophotographer. One of the main features of Levenhuk Ra 250RC F8 OTA is the primary mirror made of quartz with a dielectric coating of 99% reflectivi... további információk

Levenhuk Ra 250RC F8 OTA is a Ritchey-Chrétien telescope with an aperture of 250 mm (9.8 in) and a focal length of 2000 mm (78.7 in) in a traditional metal shell. This model is perfect for any keen astrophotographer. One of the main features of Levenhuk Ra 250RC F8 OTA is the primary mirror made of quartz with a dielectric coating of 99% reflectivity. This model is also fitted with a dual-speed Crayford focuser with the 2'' large diameter thread.

The quartz glass of the primary mirror has one of the lowest thermal conductivity coefficients among optical materials. This model is fitted with a built-in cooling fan for the primary mirror (12V). The relatively compact size of the telescope tube allows for a smaller mount to be used, unlike Newtonian telescopes.

It is recommended that you use the Levenhuk 0.75x focal reducer with any Ritchey-Chrétien model.

Read a useful article "How to choose a telescope" here.

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

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

Find some interesting information on what you can see with a telescope here.

Optikai kialakítás

Ritchey-Chretien

Optikai anyagok

quartz

Optikai bevonat

dielectric, 99% reflectivity

Elsődleges tükör átmérője (rekesznyílás), mm

250

Másodlagos tükör átmérje, mm

105

Lencse (tükör) alakja

hyperboloid

Fókusztávolság, mm

2000

Fókuszarány

f/8

Felbontási küszöbérték, ívmásodperc

0.55

Diffraction limit, lp/mm

over 1/10

Fókusz-állító

2'' dual-speed Crayford

Tube-mount assembly system

dovetail plate

Optical tube material

acél

Optikai tubus átmérője, mm

299x736
11.8x29

Optikai tubus súlya, kg

15.9
35.1

Rendeltetés

Általános használatra tervezett termék.
A terméket 3 évnél idősebb gyermekek már használhatják.

Tömeg, kg

21.2
46.7

Levenhuk Vélemények:

Read a useful article "How to choose a telescope" here.

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

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

Find some interesting information on what you can see with a telescope here.

There are no recent reviews available for this product.

Levenhuk Vélemények:

Read a useful article "How to choose a telescope" here.

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

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

Find some interesting information on what you can see with a telescope here.

Levenhuk Ra 250RC F8 OTA - Total: 10 Negatív 0 Pozitív 10


Rubin Begeja (2015-11-14 01:21): Pozitív
Does this telescope has any corrector or it is a simple Ritchey-Chrétien design? Levenhuk Customer Service:
Dear Rubin, thank you for interest in Levenhuk products. The corrector can be purchased separately. Currently, we do not have it in stock. Is there any additional information you might need?

Ray Jacobs (2015-09-20 01:30): Pozitív
Which telescope is better suited for deep-sky viewing: Levenhuk Ra 250RC F8 OTA or Levenhuk Ra 300N Dob? Levenhuk Customer Service:
Levenhuk Ra 300N Dob Telescope will be preferable due to its larger objective lens diameter.

Pete Chang (2015-01-17 01:15): Pozitív
I can't seem to be able to find a finder scope on the pictures in the product gallery. Please clarify Levenhuk Customer Service:
The kit of Levenhuk Ra 250RC F8 OTA doesn't include a finder scope. Suitable finder scope may be purchased separately.

Tony Licata (2014-03-31 12:36): Pozitív
Where are the mirrors made GSO? Are the coatings protected? Where is Levenhuk located? Levenhuk Customer Service:
Dear Tony, thank you for interest in Levenhuk products! The telescope and the mirrors are made by Levenhuk, in the PRC. The primary mirror made of quartz with a dielectric coating of 99% reflectivity. Levenhuk is located in Illinois. You can find the review of the Levenhuk Ra 200RC F8 Carbon OTA here: https://www.levenhuk.com/reviews/ra_200rc_carbon_ota_review/ Is there any additional information you might need? Looking forward to your reply.

Peter Wilson (2013-12-25 05:10): Pozitív
Is Ritchey-Chretien scheme better for deep sky or planet observations? Levenhuk Customer Service:
Levenhuk Ra 250RC F8 OTA Telescope is better suitable for deep-sky.

Anthony Golden (2013-11-08 09:33): Pozitív
Please tell me what mount is recommended for this tube? Can OMNI CG-4 support its weight? Levenhuk Customer Service:
Yes, this mount is compatible with Levenhuk Ra 250RC F8 OTA. Also please take note of this mount: https://www.levenhuk.com/products/levenhuk-mount-eq5-goto/

David Fisherowski (2013-09-20 04:26): Pozitív
I don't see your .75 x focal reducer listed. Is it available? Levenhuk Customer Service:
Hello David, thank you for interest in Levenhuk products. Unfortunately, the Levenhuk 0.75x focal reducer is currently out of stock. We expect to get it back in stock in November. Is there any additional information you might need? Looking forward to your reply.

Daniel Perry (2013-08-14 04:59): Pozitív
I am well aware that they are extension rings! You didn't answer the question. What are they for? Do those rings increase focal length and decrese focal ratio or is it the other way round? Levenhuk Customer Service:
These extension rings allow visual or astrophotography accessories to reach focus.

Daniel Perry (2013-08-09 11:17): Pozitív
Levenhuk Ra 250RC F8 OTA: included in the kit: batteries kit, mounting rings (you can see them on the first pic in the gallery). Thanks in advance. Levenhuk Customer Service:
Those are extension rings.

Jerry Harrison (2013-05-17 09:10): Pozitív
Which glass is used? What are the advantages of hyperboloid mirror shape and using quartz as optics material for the primary mirror? Levenhuk Customer Service:
The hyperboloid shape eliminates spherical aberrations and coma. The quartz glass of the primary mirror has one of the lowest thermal conductivity coefficients among optical materials.
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