TAL TAL-100RS, Service Manual

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Fig. 4

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Optical train:

1 - achromatic objective lens; 2 - diagonal mirror;

3 - eyepiece; 4 - finderscope

For easy observation of celestial objects near by zenith an eyepiece set of

telescope turned to optical axis by 90° with the help of plane diagonal mirror

2. If it is necessary one should use a finderscope consisted of objective lens ,

reticle with cross-hair  and eyepiece that to allow locating an object in the

centre of field of view.

6 . PREPARATION FOR OPERATION

6.1. Telescope assembling

For convenience of transportation and storage the telescope is supplied in

disassembled condition. An assembling of telescope is fulfilled before

observation.

Prior to assembling the units and parts should be cleaned from slushing

compound of plant.

Tripod is located on the place of observation. One should fix a table 3

(fig. 2) using for changeable parts.

The equatorial mounting is set on mounting of tripod and fixed from below

by means of clip.

One should set an axis with counterweights 7 (fig. 3) by thread on declination

axis 5 and fix by means of nut.

Folding clips are fixed on the mounting’s bracket 3 which are used for fixation

of telescope’s tube 1 (fig. 1).

The finderscope is fixed on the tube with six set screws.

If the telescope is completed with pier, three supports provided captive screws

are fixed to the lower end of the pier through holes. The equatorial mounting is

set on the upper end of the pier.

6.2.  Telescope balancing

For smooth motion of the telescope and reliable operation of the slow motion

knob it is important to balance its movable parts on the axes of the equatorial

mounting.

For this purpose one should set the telescope tube in the horizontal position,

unscrew the bolt of brake 2 (fig. 3) of the declination axis and holding slightly

the tube by hand see to it whether it remains in the indifferent equilibrium. If

the tube is not in balance, undo the screws of the clips, which fix the tube and

move the tube along its axis until it will be in balance. After that one screws in

the screws of the clips.

For balancing the telescope relative to the polar axis it is necessary to set the

declination axis in the horizontal position. Then it is necessary to screw up the

bolt of brake 2 (fig. 3) of the declination axis. Holding the axis by hand see to

it whether the telescope is in balance about the polar axis. If the telescope is

not in balance, move counterweight 7(fig. 3) along the declination axis. When

mounting the various devices on the telescope, for example, a camera, it is

required to balance the telescope additionally.

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