Levenhuk Levenhuk Ra 150N Dob, Руководство пользователя

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Dobsonian Telescopes Levenhuk Ra
Congratulations on your purchase of a high-quality Levenhuk telescope! These instructions will help you set up, properly use, and
care for your telescope. Please read them thoroughly before getting started.
CAUTION! Never look directly at the Sun — even for an instant — through your telescope or finderscope without a
professionally made solar filter that completely covers the front of the instrument, or permanent eye damage may result.
To avoid damage to the internal parts of your telescope, make sure the front end of the finderscope is covered with
aluminum foil or another non-transparent material. Children should use the telescope under adult supervision only.
All parts of the telescope will arrive in one box. Be careful when unpacking it. We recommend keeping the original shipping
containers. In the event that the telescope needs to be shipped to another location, having the proper shipping containers will
help ensure that your telescope survives the journey intact. Make sure all the parts are present in the packaging. Be sure to check
the box carefully, as some parts are small. No tools are needed other than those provided. All screws should be tightened securely
to eliminate flexing and wobbling, but be careful not to overtighten them, as that may strip the threads.
During assembly (and anytime, for that matter), do not touch the surfaces of the optical elements with your fingers. The optical
surfaces have delicate coatings on them that can easily be damaged if touched. Never remove mirrors from their housing, or the
product warranty will be null and void.
Telescope assembly
Before you can begin your first observations with your new Levenhuk telescope, you have to assemble the Dobsonian mount and
prepare the OTA for observations. It is recommended that you assemble the telescope in the order indicated in this user guide.
1
Mount assembly
2
Finderscope assembly
Locate the finderscope bracket and remove the rubber ring from it. Slide the rubber ring into the groove on the finderscope tube.
Slide the finderscope bracket into the mount on the optical tube and tighten the screw to hold the bracket in place. Loosen the
two adjustment thumbscrews on the bracket. Slide the finderscope tube into the bracket until the rubber ring locks in place.
Retighten the thumbscrews.
3
Eyepiece assembly
Remove the dust cap and loosen the thumbscrew at the end of the focuser tube. Insert the desired eyepiece and retighten the
thumbscrews to hold the eyepiece in place. Complete assembly of the OTA and base.
4
After you have assembled the OTA and the mount, you can place the optical tube on the wood base. Once this is complete, you
can start observing the night skies.
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Specifications
Levenhuk Ra 150N Levenhuk Ra 200N Levenhuk Ra 250N Levenhuk Ra 300N
Optical design Newtonian reflector Newtonian reflector Newtonian reflector Newtonian reflector
Optics material BK-7 glass BK-7 glass BK-7 glass BK-7 glass
Optics coating aluminum 92~96% coating aluminum 92~96% coating aluminum 92~96% coating aluminum 92~96% coating
Primary mirror shape paraboloid paraboloid paraboloid paraboloid
Primary mirror diameter
(aperture), mm
153 200 250 304
Focal length, mm 1215 1200 1250 1520
Focal ratio f/8 f/6 f/5 f/5
Highest practical power, x 306 400 500 608
Resolution threshold,
arcseconds
0.69 0.69 0.5 0.46
Limiting stellar magnitude 14.2 14.2 14.7 14.9
Focuser 1.25" Crayford 2'' dual-speed Crayford 2'' dual-speed Crayford 2'' dual-speed Crayford
Eyepiece barrel diameter 1.25" 1.25/2" 1.25/2" 1.25/2"
Mount type altazimuth, Dobsonian altazimuth, Dobsonian altazimuth, Dobsonian altazimuth, Dobsonian
Mount control type manual manual manual manual
Tube-mount assembly
system
spring load side bearing brake system side brake system side brake system side
Optical tube material metal metal metal metal
Eyepieces
Plössl 9mm
Plössl 25mm
Plössl 9mm
Super View 30mm
Plössl 9mm
Super View 30mm
Plössl 9mm
Super View 30mm
Finderscope optical, 6x30mm optical, 8x50mm optical, 8x50mm optical, 8x50mm
Cooling fan
—
+ + +
Batteries (for cooling fan)
—
6pcs АА (not included) 6pcs АА (not included) 6pcs АА (not included)
Operating temperature
range, °C/°F
−5… +35 / 23… 95 −5… +35 / 23… 95 −5… +35 / 23… 95 −5… +35 / 23… 95
The manufacturer reserves the right to make changes to the product range and specifications without prior notice.
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