Meade lx-90 Manual De Instruções

15

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 (9, Fig. 1) and Dec lock (6, Fig. 1).

2.

Move your telescope to observe distant street signs, mountains, trees, and other struc-
tures. Use your viewfinder to 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.

Practice focusing objects with the focus knob (8, Fig. 1).

5.

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 handbox operation, you can counteract the drift using
the automatic tracking feature in the Autostar Setup menu (see "TO TRACK AN OBJECT
AUTOMATICALLY," page 18), or by using Autostar's GO TO capabilities (see "GO TO SAT-
URN," page 20).

The LX90 ia an excellent high-resolution, ter-
restrial (land) telescopes. Viewing terrestrial
objects requires looking along the Earth's sur-
face through heat waves. These heat waves
often cause degradation of image quality.
Lower power eyepieces, like the Super
Plössl 26mm 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.

You may observe land and astronomical
objects using Autostar's Arrow keys to move
the telescope.

1.

Make sure that the Dec and R.A. locks (6
and 9, Fig. 1) are secured as described
on page 5. 

2.

Verify that Autostar is properly connected
to your telescope. See “HOW  TO
ASSEMBLE YOUR TELESCOPE,” page 13. 

      LX90 TIPS

 

Can you ever have too much power? If the
type of power you’re referring to is eyepiece
magnification, yes, you can! The most com-
mon mistake of the beginning observer is to
“overpower” a telescope by using high magni-
fications which the telescope’s aperture and
atmospheric conditions can not reasonably
support. Keep in mind that a smaller, but
bright and well-resolved image is far superior
to one that is larger, but dim and poorly
resolved (see below). Powers above 400X
should be employed only under the steadiest
atmospheric conditions. 

Autostar can calculate the best eyepiece for
you to use. Try out the “Eyepiece Calc” fea-
ture in the Utilities menu.

Most observers should have three or four
additional eyepieces to achieve the full range
of reasonable magnifications possible with
the LX90 telescopes. See “OPTIONAL
ACCESSORIES,” page 39.