Important Note:
Objects appear upside-
down and reversed left-for-
right when observed in the
viewfinder. Objects viewed
through the telescope
eyepiece when inserted into
the diagonal prism and
microfocuser assembly
appear right-side-up, but
reversed left-for-right.
This image inversion is of
no consequence when
observing astronomical
objects and, in fact, all
astronomical telescopes
yield inverted images.
During terrestrial observing,
where a fully-correctly-
oriented image (right-side-
up and correct left-for-right)
is desirable, an optional
#928 45° Erecting Prism is
available. See OPTIONAL
ACCESSORIES, page 44.
NEVER point the
telescope
directly at or
near the Sun at
any time! Observing the
Sun, even for the smallest
fraction of a second, will
result in instant and
irreversible eye damage, as
well as physical damage to
the telescope itself.
Warning:
Do not look through the
telescope’s eyepiece or
viewfinder while it is rapidly
moving. Children should
always have adult supervision
while observing.
Want to learn more about
Slew Speeds? See Slew
Speeds, page 18.
Note:
Viewing conditions vary widely
from night-to-night and site-to-
site. Turbulence in the air,
even on an apparently clear
night, can distort images.
Low-power eyepieces, such
as the 26mm Plössl supplied
with your telescope, are better
suited to resolving images in
poor viewing conditions.
OBSERVING
Observing by Moving the Telescope Manually
If you wish to observe a distant land object, such as a mountain top or a bird, you can
observe by merely pointing the telescope and looking through the eyepiece.
1. Loosen the telescope’s R.A. lock (Pg. 7, Fig. 1, 12) and Dec. lock (Fig. 1, 17).
2. Move your telescope to observe distant street signs, mountains, trees, and other
structures. Use your viewfinder to help site-in on an object.
3. Center the object in the viewfinder’s crosshairs and then in the telescope
eyepiece. When the object is centered in your eyepiece, remember to re-tighten
the R.A. and Dec. locks.
4. To move telescope in the R.A. and Dec. axes again, remember to loosen the R.A.
lock and tighten the Dec. lock. Then rotate the manual slow motion control knobs
(Fig. 1, 10) and (Fig. 1, 16) .
5. Practice focusing objects using the coarse focus knob (Fig. 1, 6).
Important Note: The telescope is shipped with the mirror locked. Before
using the coarse focus knob , rotate the mirror lock knob (Fig. 1, 9) towards
the “unlock” position, until it feels loose.
6. Once you get a feel for how your telescope moves and focuses, try to view
something more challenging, like a bird or a distant moving train.
You can also observe stars and objects in the night sky using this method, but note
that objects begin to slowly drift across the eyepiece field. This motion is caused by
the rotation of the Earth. As you become familiar with the AutoStar II handbox
operation, you can counteract the drift using the automatic tracking feature in the
AutoStar II Setup menu (see
TO TRACK AN OBJECT AUTOMATICALLY, page 19), or by
using AutoStar II’s GO TO capabilities (see
GoTo SATURN, page 21).
Terrestrial Observing
The LX200-ACF models are excellent high-resolution terrestrial (land) telescopes.
Viewing terrestrial objects requires looking along the Earth’s surface through heat
waves. These heat waves often cause degradation of image quality. Lower power
eyepieces, like the Series 4000 26mm Super
Plössl
eyepiece, magnify these heat
waves less than higher power eyepieces. Therefore, lower power eyepieces provide a
steadier, higher quality image. If the image is fuzzy or ill-defined, reduce to a lower
power eyepiece, where the heat waves do not have such an effect on image quality.
Observing in early morning hours, before the ground has built up internal heat,
produces better viewing conditions than during late afternoon hours.
Observing Using AutoStar II’s Arrow Keys
You may observe land and astronomical objects using AutoStar II’s Arrow keys to
move the telescope.
1. Tighten the R.A. and Dec. locks (Fig. 1, 12 and 17).
2. Verify that AutoStar II is properly connected to your telescope. See
HOW
TO
ASSEMBLE YOUR TELESCOPE,
page 13.
3. Flip the telescope power switch to the ON position.
The AutoStar II screen is activated and a copyright message displays briefly, followed
by a short beep. Then AutoStar II takes a few moments to start up the system.
4. A message displays that warns not to look at the Sun. At the end of this message,
press the key prompted by AutoStar II to signify that the message has been read
and understood.
5. “Automatic Alignment” displays. Press any AutoStar II key to abort automatic
alignment.
6. The Arrow keys are now activated. Press the Arrow keys (Pg. 10, Fig. 2, 5) to
slew (move) the telescope up, down, right, or left.
7. Press the Speed key (Number key “1”) and then a Number key (Fig. 2, 6) to
change the telescope’s slew speed. (“1” is the slowest speed, “9” is highest
speed.)
8. Use the viewfinder (Fig. 1 , 22) to locate an object and practice using the
AutoStar II’s Arrow keys to center the object in the telescope’s field of view.
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