Handleiding Meade ETX-90AT (pagina 16 van 60) (Engels)

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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 horizontal lock (

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

2. Move your telescope to observe distant street signs, mountains, trees and other

structures. Use your viewfinder to help sight-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 horizontal and vertical locks.

4. Practice focusing objects using 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 (see

TO TRACK AN

OBJECT AUTOMATICALLY, page 17) or by using Autostar's GO TO capabilities (see

GO TO SATURN, page 20).

Terrestrial Observing

ETX telescopes 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 26mm, magnify these heat waves less than higher power eyepieces (such as

a 9mm eyepiece). Therefore, lower power eyepieces provide a steadier, higher qual-

ity 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 morn-

ing hours, before the ground has built up internal heat, produces better viewing

conditions than during late afternoon hours.

Observing Using Autostar Arrow Keys

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

the telescope.

1. Tighten the horizontal and vertical locks (

9 and 6, Fig. 1).

2. Make sure that Autostar’s coiled cord is connected to the computer control

panel’s HBX port (

C, Fig. 2).

3. Flip the Power Switch (

A, Fig. 2) on the computer control panel to the ON

position. A copyright message lights on Autostar’s LCD display, followed by a

warning not to look at the Sun. Press the Autostar key prompted by the message

when you are done reading. See page 9 to 11 for more information about

Autostar’s keys.

4. A “Getting Started” message displays. Press ENTER to skip this message.

5. Keep pressing the ENTER key until "Country/State" displays. (Ignore the

prompts requesting "Date" and "Time" for now—these functions will be explained

later).

6. When “Country/States” displays, press either one of the SCROLL KEYS to cycle

through the choices on the list. When your state or country appears on the list, press

ENTER.

7. “Cities” displays. Using the SCROLL KEYS, cycle through the list of cities and press

ENTER when your city or the city closest to your observing site displays.

8. Finally “Telescope Models” displays. Using the SCROLL KEYS, cycle through the

list of telescope models and press ENTER when your model displays.

9. The display now displays "Setup: Align." .

You can now use the ARROW KEYS to slew (move) the telescope up, down, right or

left. Practice using the ARROW KEYS to center objects in the eyepiece.

To change the speed at which the telescope moves (known as the “slew” speed),

press a NUMBER KEY from 1 through 9. 1 is the slowest speed and 9 is the fastest.

See

SLEW SPEEDS on the following page.

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.

Do not look through the

telescope's eyepiece or

viewfinder while it is rap-

idly moving. Children

should always have adult

supervision while

observing.

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 supplied with your

telescope, are better suited

to resolving images in poor

viewing conditions.

Important Note:

Autostar requests the

Country/State, City and

Telescope Model

information only the first

time

Autostar is activated.

Subsequently, Autostar

uses the location and

model number you have

chosen.

If you wish to change this

information, use the

"Telescope Model" and

"Site" options in the Setup

menu. See pages 28, 29

and 31 for more

information.

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