ORION TELESCOPES & BINOCULARS AstroView 90mm EQ 9024, Инструкция по эксплуатации, Страница: 5 / 16

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tighten the two black nylon screws a couple of turns each
to secure the finder scope in place.
13. Insert the base of the finder scope bracket into the
dovetail slot on the top of the focuser housing. Lock the
bracket in position by tightening the knurled thumbscrew
on the dovetail slot.
14. Insert the chrome barrel of the star diagonal into the
focuser drawtube and secure with the thumbscrew on the
drawtube.
15. Then insert an eyepiece into the star diagonal and secure
it in place with the thumbscrews on the diagonal. (Always
loosen the thumbscrews before rotating or removing the
diagonal or an eyepiece.)
3. Balancing the Telescope
To insure smooth movement of the telescope on both axes
of the equatorial mount, it is imperative that the optical tube
be properly balanced. We will first balance the telescope with
respect to the R.A. axis, then the Dec. axis.
1. Keeping one hand on the telescope optical tube, loosen
the R.A. lock knob. Make sure the Dec. lock knob is
locked, for now. The telescope should now be able to
rotate freely about the R.A. axis. Rotate it until the coun-
terweight shaft is parallel to the ground (i.e., horizontal).
2. Now loosen the counterweight lock knob and slide the
weight along the shaft until it exactly counterbalances the
telescope (Figure 3a). That’s the point at which the shaft
remains horizontal even when you let go with both hands
(Figure 3b).
Figure 3a.
Balancing the telescope with respect to the R.A.axis
by sliding the counterweight along its shaft.
Figure 3b.
The telescope is now balanced on the R.A. axis.
That-is, when hands are released, the counterweight shaft remains
horizontal
Figure 3c.
Preparing the telescope to be balanced on the Dec.
axis by first releasing the Dec. lock knob.
Figure 3d.
Balancing the telescope with respect to the Dec. axis.
As shown here, the telescope is out of blance (tilting).
Figure 3e.
Telescope is now balanced on the Dec. axis, i.e., it
remains horizontal when hands are released.