Levenhuk Ra 150C Guia Del Usuario página 4

Levenhuk Ra 150C Cassegrain OTA
Congratulations on your purchase of a high-quality Levenhuk telescope! These instructions will help you set up, properly use,
and care for this device. 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 coverewith 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. Be sure to check the box carefully, as some parts are small. 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 lenses or mirrors from their
housing, or the product warranty will be null and void.
Telescope assembly
Note! A finderscope, eyepieces, diagonal mirror, T-ring, and camera are not included in the kit.
Finderscope, diagonal mirror and eyepiece assembly
• Attach the finderscope base onto the optical tube. Loosen the thumbscrew on the base. Install the finderscope onto the base.
Retighten the thumbscrew.
• To install an extension ring or a diagonal mirror remove the focuser by rotating the attachment collar counterclockwise,
insert the desired accessory and re-attach the focuser. Afterward, you can insert the eyepiece into the already attached
diagonal mirror or extension ring.
Attaching the OTA to a mount
Your Cassegrain OTA has a dovetail plate that is used to attach the optical tube to a compatible EQ or AZ-EQ mount. The long
length of the dovetail mount makes it easy to balance the telescope on the declination axis by sliding the OTA back or forward.
Operating the telescope
Focusing
During celestial observations, out-of-focus images of dim stars may be very diffuse, making it difficult to focus on such objects.
Choose a brighter celestial body (such as the Moon) as your first observation object, and focus your view. With a 10:1 fine focus
adjustment (meaning that 10 turns of the fine focus knob equal 1 turn of the coarse focus knob), you can adjust the focus of
your view with great precision. Use the coarse focus knob to adjust the view until your object is as close to focus as possible,
and then make fine adjustments with the fine focus knob.
Eyepieces and magnification
An eyepiece magnifies the image produced by the OTA. The longer the focal length, the lower the eyepiece magnification, and
vice versa. Therefore, it is recommended to have several eyepieces in your equipment. The total power of the telescope setup
may be calculated with the following formula:
Magnification = Focal Length of Telescope (mm) / Focal Length of Eyepiece (mm)
Keep in mind that every telescope has a practical power limit of 1.5—2D (D is the aperture of the telescope in mm). At higher
powers, an image will always be dimmer and less sharp; the viewing conditions (the "seeing") may also affect the quality of
resulting images. It is recommended to begin observations at low magnifications (longest focal length). After you have located
the desired object, you can try switching to a high-power eyepiece, if seeing conditions permit.
Astrophotography
Most CCD cameras have a 1.25" or 2" barrel. Simply insert the nosepiece of the CCD camera or the adapter into the focuser and
lock it place with two thumbscrews.
To attach a DSLR camera, you will need an appropriate T-ring and a camera adapter. Simply attach the T-ring to the camera body
and thread the camera adapter onto the T-ring. Insert the barrel of the camera adapter into the focuser and secure it in place
with two thumbscrews.
You may want to consider using a remote shutter release instead of the shutter release on the camera. Touching the camera may
shake the instrument and blur the resulting image. Also, make sure the tripod is steady.
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