Orion OBSERVER 70MM AZ Manual page 7

Details of the optical tube and components
Figure 2a shows the details of the optical tube (1) and its various parts. The optical tube is shown attached to the mount for clar-
ity. Figure 2b is a close up of the focuser with even more detail.
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objective lens
This is the main optical component of the telescope. It is
an achromatic, fully coated 70mm diameter lens.
9
Glare/Dew shield
This is a simple hood for the objective lens (8) that pre-
vents dew formation and stray light from hitting the
lens.
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altitude castings
These castings are built into the optical tube (1). The yoke
knobs (18) thread into these castings through the holes
in the top of the yoke altazimuth mount (5) to secure
the two parts together.
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EZ Finder ii mounting bracket
This secures the EZ Finder II (4) to the optical tube (1).
12
Micro-motion rod attachment post
This post is where the micro-motion rod (13) attaches to
the optical tube (1).
13
altitude micro-motion control rod and thumb-
wheel
This allows fine adjustment of the telescope in the alti-
tude (up-down) direction. For more details, see the
Getting Started section.
®
14
Focuser drawtube
This is where the 90° mirror star diagonal (2) is inserted.
The drawtube is adjusted by the turning the focus
wheel (15), which adjusts a rack-and-pinion gear sys-
tem to bring objects into focus.
15
Focus wheels
These wheels, when turned, move the focuser drawtube
(14) in or out. Use it to bring things into focus when you
are looking in the eyepiece (3).
16
Diagonal holder thumbscrews
These two thumbscrews secure the 90° mirror star diago-
nal (2) into the focuser drawtube (14). These should
only be loosened to remove or rotate the star diago-
nal.
17
Eyepiece holder thumbscrews
These thumbscrews hold the eyepiece in position. Tighten
them after inserting an eyepiece (3); loosen them
before removing or changing eyepieces.
18
Yoke knobs
These knobs secure the optical tube to the altazimuth
yoke mount (5). They should always be securely tight-
ened.
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