Orion SPACEPROBE 130ST EQ Manuel d'utilisateur télécharger pdf (Page 5)

your fingers (Figure 3b). Push the finder scope through

the bracket until the O-ring seats just inside the front

opening of the bracket’s cylinder. Now, release the ten-

sioner and 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 dove-

tail slot near the focuser. Lock the bracket into position by

tightening the knurled thumb screw on the dovetail slot.

14. Remove the cap from the focuser and insert the chrome

barrel of one of the eyepieces into the drawtube. Secure

the eyepiece with the thumb screws on the drawtube.

Remember to always loosen the thumb screws before

rotating or removing the eyepiece.

The telescope system is now fully assembled. Keep the dust

cap over the front end of the telescope when it is not in use.

4. Getting Started

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 4a). That’s the point at which the shaft

remains horizontal even when you let go of the telescope

with both hands (Figure 4b).

3. Retighten the counterweight lock knob. The telescope is

now balanced on the R.A. axis.

4. To balance the telescope on the Dec. axis, first tighten

the R.A. lock knob, with the counterweight shaft still in the

Figure 3a. The 6x30

finder-scope.

Figure 3b. Inserting the

finder scope into the finder scope

bracket

Focus

lock ring

Alignment thumbscrews

Tensioner

Objective

lense

Finder Scope Bracket

Figure 4. Proper operation of the equatorial mount requires that

the telescope tube be balanced on both the R.A. and Dec. axes. (a)

With the R.A. lock knob released, slide the counterweight along the

counterweight shaft until it just counterbalances the tube. (b) When

you let go with both hands, the tube should not drift up or down. (c)

With the Dec. lock knob released, loosen the tube ring lock clamps

a few turns and slide the telescope forward or back in the tube

rings. (d) When the tube is balanced about the Dec. axis, it will not

move when you let go.

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Orion SPACEPROBE 130ST EQ Manuel d'utilisateur Page 5

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