Meade EXT90, Инструкция по эксплуатации, Страница: 40 / 60

when the correct location displays.
d. The next screen asks for the city (listed
alphabetically) closest to the observing site.
Use the Scroll keys to scroll through the list
of cities. Press ENTER when the correct city
appears on screen.
5. Daylight Savings Time: The next screen
requests the status of Daylight Savings Time.
If Daylight Savings Time is active, press the
1 key. If Daylight Savings Time is not active,
press the 2 key.
Note: Daylight Savings Time may be referred
to by a different name in various areas of
the world.
6. Telescope Model: AutoStar then asks for the
Telescope Model. Using the scroll keys (Pg. 20,
Fig. 10, 7) on the AutoStar locate the model of
your telescope and press enter.
7. The ETX90 is equipped with an internal time
chip and will know the correct time and date
right out of the box. However, if you need to
change these values they are found in the setup
menu. See page 29 for more information.
8. With “Align: Easy” displayed, use the Scroll
Keys to display “Align: Two Star”. Press Enter.
9. AutoStar will now describe the correct home
position for the telescope. Once the telescope
is in the correct home position, press ENTER.
See page 9 for more information.
10. “Select Star” displays. AutoStar then displays
a database of stars for the observer to choose
from. Use the Scroll keys to scroll to a star on
the list that you wish to align upon. Select a star
that you can easily locate in the night sky. Press
ENTER.
11. The telescope slews to the star. Use the Arrow
keys to move the telescope until the star is
centered in the eyepiece. Press ENTER.
12. Repeat procedure for the second alignment
star. The telescope is aligned and you are now
ready to use Autostar’s GO TO capabilities for
a night of observing.
Too Much Power?
Can you ever have too much power? If the
type of power you’re referring to is eyepiece
magnification, yes, you can! The most
common mistake of the beginning observer
is to “overpower” a telescope by using high
magnifications which the telescope’s aperture
and atmospheric conditions cannot 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
Figs. 15a and 15b to the left). Powers above 175x
should be employed only under the steadiest
atmospheric conditions.
Most observers should have three or four
additional eyepieces to achieve the full range
of reasonable magnifications possible with
the ETX90 telescopes. See OPTIONAL
ACCESSORIES, page 17.
ETX90 TIPS
Figs. 15a & 15b: Jupiter; examples of the right amount of
magnification and too much magnification.
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