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The Meade #126 2x Barlow lens is an achromatic, high-
performance, short-focus Barlow Lens, perfectly suited to the
low-profile design of both ETX models. Lens surfaces are multi-
coated for maximum image contrast and light transmission.
# 825 8 x 25 mm Right-Angle Viewfinder: Included as standard-
equipment on ETX-125EC models, the 8 x 25mm Right-Angle
Viewfinder
(Fig.
27)
permits a comfortable 90°
viewing
position
with
90mm ETX models as
well. The #825 fits into the
same
bracket
as
the
8x21mm viewfinder sup-
plied
with
ETX-90EC
telescopes. The finder's
wide-angle
7.5°
actual
Fig. 27: #825 Right-Angle
field
facilitates
object
Viewfinder.
location and a helicoid
mechanism allows precise focusing.
#64 T-Adapter: The basic means of photography through any
ETX telescope, the #64 T-Adapter (1,Fig. 28) threads to the rear
cell of the telescope, followed by a T-Mount appropriate to the
user's brand of 35mm camera. In this way, the camera body is
rigidly coupled to the telescope's optical system, which in effect
becomes the camera's lens (see PHOTOGRAPHYWITHBOTH ETX
MODELS, page 15).
#880 and #881 Table Tripods: ETX-90EC and ETX-125EC
models permit pushbutton tracking of astronomical objects from
their standard-equipment Electronic Controllers. For fully
automatic tracking a table tripod (Fig. 28), or the #883 Deluxe
Field Tripod may be added allowing for polar alignment of the
telescope.
1
3
Fig.28: Example of astronomical photography using the
#880 Table Tripod with an ETX-90EC. (1) #64 T-Adapter;
(2) Standard tripod leg; (3) Fixed tripod legs;
(4) Balance weight; (5) High-latitude tripod leg.
Each table tripod includes two fixed legs and two variable-length
legs inscribed with a range of latitude settings for quick polar
alignment. The #880 Table Tripod (for the ETX–90EC) and #881
Table Tripod (for the ETX-125EC) attach quickly to the telescope
drive base.
Two identical fixed tripod legs (3, Fig. 28) mount to holes on the
side of the drive base. The adjustable standard tripod leg (2, Fig.
28), with its two latitude scales, is mounted to one of two holes
on the bottom of the drive base. It permits the telescope to be
polar aligned for latitudes between 22° and 48.5° (ETX-90EC) or
between 23.25° and 49.5° (ETX-125EC). The shorter high-
latitude tripod leg (5, Fig. 28) is substituted for the standard
tripod leg at latitudes between 44° and 66° (ETX-90EC) or 44.5°
and 67° (ETX-125EC).
OPTIONAL ACCESSORIES
5
4
2
z
#1422 Low-Latitude Balance Weight (for ETX-90EC): If the
ETX-90EC is to be used with the #880 Table Tripod and polar-
aligned at latitudes below 30°, the telescope can become
unbalanced, particularly if heavier accessories (e.g., a camera
body) are attached to the eyepiece-end of the telescope. The
low-latitude balance weight (4, Fig. 28) slides onto the standard
tripod leg and enables rock-solid stability of the telescope even
at lower latitudes.
NOTE:The low-latitude balance weight for the ETX-125EC is
supplied with the #881 Table Tripod and is recommended for use
at all latitudes covered by the standard tripod leg.
#883 Deluxe Field Tripod: Manufactured of strong, lightweight
extruded aluminum, the #883 Deluxe Field Tripod (Fig. 29)
allows standing or seated observations through both ETX
models. Tripod height is continuously adjustable from 34" to 54".
Micrometric controls in both azimuth and elevation-angle permit
precise polar alignment of the telescope's fork mount for
astronomical applications (inset, Fig. 29).
Fig. 29: The #883 Deluxe Field Tripod shown with an ETX-
90EC Astro Telescope, set up in the Alt/Az configuration
(tripod head locked at 90°), for terrestrial applications. (Inset)
Tripod head tilted for polar alignment.
Designed exclusively for both ETX model telescopes, the #883
Deluxe Field Tripod includes all the rigidity and stability required
for high-power observing through the telescope. For terrestrial
observing, where altazimuth orientation of the telescope is
desirable, the tripod head tilts and locks at 90°.
#932 45° Erecting Prism: All ETXmodels include an internal
optically-flat mirror to reflect light to the telescope's 90°
astronomical observing position. In this position the telescope's
image is upright, but reversed. For terrestrial observing with
either ETX model, the #932 45° Erecting Prism (1, Fig. 30) gives
a fully correctly oriented image and a convenient 45° observing
angle. The #932 prism threads onto the telescope's photo port
(17, Fig. 1). An eyepiece of any focal length (magnifying power)
may be inserted into the #932 prism. Note that the flip-mirror
control (4, Fig. 30) must be in the "down" position for use with
the #932 prism.
17
CHAPTER
5
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