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9
movement of the tube to suit your own preference. See
ADJUSTING THE
HORIZONTAL AND VERTICAL TENSION OF THE OPTICAL TUBE
, page 20.
8. Insert the diagonal mirror and eyepiece: Insert the diagonal mirror (8, Fig. 1)
into the focuser drawtube (9, Fig. 1) and a low-power eyepiece (
e.g.,
25mm or
26mm eyepiece) into the diagonal mirror. Tighten the eyepiece and diagonal mir-
ror thumbscrews (25 and 26, Fig. 4) to a firm feel.
Note: Some models are supplied with one of two styles of the 90° diagonal
mirror. Quantities of eyepieces and eyepiece size varies with each model.
9. Install battery (NGC Models Only): Lift the lid of the battery compartment (18,
Fig. 2) and attach a 9v battery (user-supplied) to the connector provided in the
compartment.
10. Remove dust cap: Pull to remove the dust cap from the end of the telescope.
Replace it on the telescope at the end of the observing session. The cap keeps
the telescope lens free from dust and foreign particles when it is not in use.
Attaching and Aligning the Red Dot Viewfinder
Because the main telescope has a fairly narrow field of view, locating objects directly
in the main telescope can sometimes be difficult.The red dot viewfinder (6, Fig. 1) has
a wider field of view, which permits you to more easily locate objects. When the red
dot viewfinder and optical tube are aligned to each other, both point to the same posi-
tion in the sky. An object located in the red dot viewfinder is therefore also positioned
within the field of the main telescope.
1. Attach the red dot viewfinder bracket: Remove the two attachment thumb-
screws from the optical tube. These screws are pre-threaded at the factory into
the optical telescope tube at the viewfinder location. Line up the holes in the
viewfinder bracket with the holes on the tube and thread the thumbscrews back
onto the main tube. See Fig. 10a.
2. Setting the intensity slider: Slide the switch on the side of the red dot viewfind-
er to the first position for a less intense red dot and to the second position for a
more intense red dot.The less intense red dot may be particularly useful when you
are sighting on fainter celestial objects. Slide the switch all the way to the left to
turn off. Fig. 10b.
To Align the Red Dot viewfinder:
It is recommended that you perform steps 1 and 2 of this procedure during the day-
time and step 3 at night.
1. If you have not already done so, place a low-power (
e.g.,
25mm or 26mm) eye-
piece in the diagonal mirror of the main telescope (8, Fig. 1) and point the tele-
scope at an easy-to-find land object (
e.g.,
the top of a telephone pole). Turn the
focuser knob (10, Fig. 1) so that the image is sharply focused. Center the object
precisely in the main telescope’s field of view.
2. Then, looking through the red dot viewfinder, turn one or both of the red dot
viewfinder’s alignment screws (22, Fig. 4) until the viewfinder’s red dot points pre-
cisely at the same object as centered in the main telescope.The red dot viewfind-
er is now aligned to the main telescope.
3. Check this alignment on a celestial object, such as the Moon or a bright star, and
make any necessary refinements.
Choosing an Eyepiece
A telescope’s eyepiece magnifies the image formed by the telescope’s main optics.
Each eyepiece has a focal length, expressed in millimeters, or "mm." The smaller the
focal length, the higher the magnification. For example, an eyepiece with a focal length
of 9mm has a higher magnification than an eyepiece with a focal length of 25mm.
Low-power eyepieces (
e.g.,
a 25mm or 26mm eyepiece) give a wide, comfortable field
of view with high image resolution. High-power eyepieces (
e.g.,
the 9mm eyepiece)
provides a smaller field of view but higher magnification when seeing conditions
permit.
Low power eyepieces offer a wide field of view, bright, high-contrast images, and eye
relief during long observing sessions. To find an object with a telescope, always start
with a low power eyepiece (
e.g.,
25mm or 26mm eyepiece). When the object is
Fig. 9b: Attach optical tube to cradle
ring (Style 2).
Cradle
Lock
Knob
Fig. 10a: Attach red dot viewfinder to
the optical tube.
Fig. 10b: Slide the intensity slider to
make the red dot more or less intense.
Fig. 9a: Attach optical tube to the
mount (Style 1).
Attachment
Nuts
Bracket
Intensity Slider