17
13. Vertical setting circle: (on left fork arm):
See
page 58 for detailed information.
14.
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ETX telescopes include
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the “up” position light is diverted to the eyepiece.
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light proceeds straight out the photo port for
photography.
Note:
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when the control is vertical (perpendicular to
WKHWHOHVFRSHWXEH7RSODFHWKHÀLSPLUURULQ
the “down” position, turn the control until it is
horizontal.
15. Front lens:
The high quality 80mm Achromatic
lens starts with two pieces of optical glass.
16. OTA mounting thumbscrews:
Attaches the ETX
optical tube to the mount using two ¼-20 mounting
screws. Take off the optical tube to reduce the
telescope weight or size. Install another optical
tube to make the ETX observer even more
versatile.
17. Bubble level/compass:
Used to aide in setting
the telescope in the Home Position. See page
12, Fig 4. When placed in the 90° eyepiece holder
the bubble level compass can be used to level the
telescope and determine the direction of magnetic
North.
18. Horizontal lock knob:
Controls the manual
horizontal rotation of the telescope. Loosen the
horizontal lock counterclockwise to unlock the
telescope, enabling it to be freely rotated by hand
about the horizontal axis.
Tightening the horizontal lock clockwise prevents
the telescope from being rotated manually, but
engages the horizontal motor drive clutch for
AudioStar operation. When polar aligned, the
horizontal lock serves as the Right Ascension
or R.A. lock.
19. Battery compartment:
Accessible thru the battery
compartment door on top of base housing. Install
six user-supplied AA batteries, oriented as shown
on the diagram on the battery slots of the battery
holder in this compartment. See page 7 for more
ETX 80 KEY
FEA
T
URES
information. Replace the cover.
CAUTION:
Use care to install batteries as
indicated by the battery compartment. Follow
battery manufacturer’s precautions. Do not
install batteries backwards or mix new and
used batteries. Do not mix battery types. If
these precautions are not followed, batteries
PD\ H[SORGH FDWFK ¿UH RU OHDN ,PSURSHUO\
installed batteries void your Meade warranty.
Always remove the batteries if they are not to
be used for a long period of time.
20. Horizontal setting circle:
See page 58 for
detailed information.
21. 2x Flip-Barlow
: Flip the switch to engage the
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of your eyepiece. If you use the Flip Barlow, you may
need to turn the focus knob in a counterclockwise
direction 20 or more turns to focus with the Barlow
engaged. When using the Barlow, you'll notice
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22. Dew Shield (not shown):
Slows down the
advance of dew formation on the optics, which
distorts the view.
