Orion Observer 70 EQ Instruction 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.
14
objective lens
This is the main optical component of the telescope. It is
an achromatic, fully coated 70mm lens.
15
Glare/Dew shield
This is a simple "hood" for the objective lens (14) that pre-
vents dew formation and stray light from hitting the
lens.
16
Equatorial mount head
The top of the equatorial mount (5). This is where the opti-
cal tube (1) is attached to the mount.
17
EZ Finder ii mounting bracket
The EZ Finder II (4) is secured to this bracket, which will
then be attached to the optical tube (1).
18
Focuser drawtube
This is where the 90° mirror star diagonal (2), or other
optional diagonal, is inserted. The drawtube is adjusted
by the turning the focus wheel (19), which adjusts a
rack-and-pinion system to bring objects into focus.
®
19
Focus wheels
These wheels, when turned, move the focuser drawtube
(18) in or out. Use it to bring things into focus when you
are looking in the eyepiece (3).
20
Diagonal holder thumbscrews
These two thumbscrews secure the 90° mirror star diago-
nal (2) into the focuser drawtube (18). These should
only be loosened to remove or rotate the star diago-
nal.
21
Eyepiece holder thumbscrews
These thumbscrews hold the eyepiece in position. Tighten
them after inserting an eyepiece (3); loosen them
before removing or changing eyepieces.
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