21
ETX 90/125 KEY
FEA
T
URES
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
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the “down” position, turn the control until it is
horizontal.
15. Front lens:
The high quality 90mm & 125mm
optics start with a front lens made of optical glass.
The primary and secondary mirrors are carefully
aligned inside the optical tube to provide the best
image possible.
16. OTA mounting thumbscrews(ETX 90 ONLY):
Attaches the ETX90 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. NOTE: The ETX125
OTA cannot be removed.
17. Bubble level/compass:
Used to aide in setting
the telescope in the Home Position. See page 19.
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
the 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
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
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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.
