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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
clarity. Figure 2b is a close-up of the focuser with even more detail.
Objective lens:
8
This is the main optical component of the telescope. It
is an achromatic, fully coated 60mm lens.
Glare/Dew shield:
9
This is a simple "hood" for the objective lens (8) that
prevents dew formation and stray light from hitting the
lens.
Altitude castings:
10
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 mount (5) to secure the two
parts together.
5x finder scope mounting bracket:
11
The 5x finder scope (4) comes inserted in this bracket
that will be attached to the optical tube (1).
Micro-motion rod attachment post:
12
This post is where the micro-motion rod (13) will be
attached to the optical tube (1).
Altitude micro-motion control rod and
13
thumbwheel:
This allows fine adjustment of the telescope in the alti-
tude (up-down) direction. For more details, see the
Getting Started section.
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Focuser drawtube:
14
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 (15), which adjusts a
rack-an-pinion system to bring objects into focus.
Focus wheels:
15
These wheels, when turned, move the focuser draw-
tube (14) in or out. Use it to bring things into focus
when you are looking in the eyepiece (3).
Diagonal holder thumbscrews:
16
Diagonal holder thumbscrews: These two thumbscrews
secure the 90˚ mirror star diagonal (2) into the focuser
drawtube (14). These should only be loosened to
remove or rotate the star diagonal.
Eyepiece holder thumbscrew:
17
This thumbscrew holds the eyepiece in position.
Tighten it after inserting an eyepiece (3); loosen it
before removing or changing eyepieces.
"Yoke" knobs:
18
These knobs secure the optical tube to the yoke mount.
They should always be securely tightened.
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