Levenhuk Ra 150N Dob Guia Del Usuario página 6

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.
Mount assembly
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.
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.
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.
Specifications
Optical design
Optics material
Optics coating
Primary mirror shape
Primary mirror diameter
(aperture), mm
Focal length, mm
Focal ratio
Highest practical power, x
Resolution threshold,
arcseconds
Limiting stellar magnitude
Focuser
Eyepiece barrel diameter
Mount type
Mount control type
Tube-mount assembly
system
Optical tube material
Eyepieces
Finderscope
Cooling fan
Batteries (for cooling fan)
Operating temperature
range, °C/°F
The manufacturer reserves the right to make changes to the product range and specifications without prior notice.
2
3
5a 5b
Levenhuk Ra 150N Levenhuk Ra 200N
Newtonian reflector
BK-7 glass
aluminum 92~96% coating aluminum 92~96% coating
paraboloid
153
1215
f/8
306
0.69
14.2
1.25" Crayford
1.25"
altazimuth, Dobsonian
manual
spring load side bearing
metal
Plössl 9mm
Plössl 25mm
optical, 6x30mm
—
—
−5... +35 / 23... 95
Levenhuk Ra 250N
Newtonian reflector
BK-7 glass
aluminum 92~96% coating
paraboloid
200
1200
f/6
400
0.69
14.2
2'' dual-speed Crayford 2'' dual-speed Crayford
1.25/2"
altazimuth, Dobsonian altazimuth, Dobsonian
manual
brake system side
metal
Plössl 9mm
Super View 30mm
optical, 8x50mm
+
6pcs АА (not included) 6pcs АА (not included)
−5... +35 / 23... 95
6
4
Levenhuk Ra 300N
Newtonian reflector Newtonian reflector
BK-7 glass
aluminum 92~96% coating
paraboloid
250
1250
f/5
500
0.5
14.7
2'' dual-speed Crayford
1.25/2"
altazimuth, Dobsonian
manual
brake system side
metal
Plössl 9mm
Super View 30mm
optical, 8x50mm
+
6pcs АА (not included)
−5... +35 / 23... 95
EN
1
BK-7 glass
paraboloid
304
1520
f/5
608
0.46
14.9
1.25/2"
manual
brake system side
metal
Plössl 9mm
Super View 30mm
optical, 8x50mm
+
−5... +35 / 23... 95