Levenhuk Ra 250N Dob Telescope - Manual (Page 3)

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.
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.
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.
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.
Telescope assembly
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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.
All parts of the telescope will arrive in one box. Be careful when unpacking it. We recommend keeping the original shipping con-
tainers. 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.
CAUTION! Never look directly at the Sun — even for an instant — through your telescope or finderscope without a profes-
sionally 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.
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Mount assembly
Finderscope assembly
Eyepiece assembly
Specifications
Model Levenhuk Ra 200N Dob Levenhuk Ra 250N Dob Levenhuk Ra 300N Dob
Optical design Newtonian reflector
Primary mirror material BK-7 glass
Mirror shape paraboloid
Primary mirror diameter (aperture), mm 200 254 300
Focal length, mm 1200 1255 1520
Magnification 400x 508x 600x
Highest practical power 400x 508x 600x
Lowest practical power 26x 36x 43x
Focal ratio f/6 f/5.1 f/5
Limiting stellar magnitude 14.2 14.7 14.9
Resolution threshold 0.69'' 0.5'' 0.46''
Focuser 2'' dual-speed Crayford
Mount type altazimuth, Dobsonian
Tube-mount assembly system quick-release thumbscrew
Finderscope optical, 8x50 mm
Eyepieces (included in the kit) 9 mm Plössl, 30 mm Super View
Optical tube length, in / mm 46 / 1170 48.4 / 1230 53.9 / 1370
Optical tube diameter, in / mm 9.4 / 240 12.2 / 310 14.1 / 360
Optical tube weight, lbs / kg 20.7 / 9.4 35.2 / 16 46.2 / 21
Mount dimensions, in / mm 19.6 x 23.6 / 500 x 600 21.2 x 25.1 / 540 x 640 24.8 x 25. / 630 x 640
Mount weight, lbs / kg 24.6 / 11.2 26.8 / 12.2 29.7 / 13.5
Gross weight, lbs / kg 62.8 / 28.5 78.2 / 35.5 94.7 / 43.0