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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 clar- ity. Figure 2b is a close up of the focuser with even more detail.
8Objective lens
This is the main optical component of the telescope. It is an achromatic, fully coated 70mm diameter lens.
9Glare/Dew shield
This is a simple hood for the objective lens (8) that pre- vents dew formation and stray light from hitting the lens.
10Altitude 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.
11EZ Finder II mounting bracket
This secures the EZ Finder II (4) to the optical tube (1).
12Micro-motion rod attachment post
This post is where the
13Altitude
This allows fine adjustment of the telescope in the alti- tude
14Focuser 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
15Focus 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).
16Diagonal 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.
17Eyepiece holder thumbscrews
These thumbscrews hold the eyepiece in position. Tighten them after inserting an eyepiece (3); loosen them before removing or changing eyepieces.
18Yoke knobs
These knobs secure the optical tube to the altazimuth yoke mount (5). They should always be securely tight- ened.
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