Orion SPACEPROBE 130ST EQ Manuel d'utilisateur télécharger pdf (Page 6)

horizontal position.

5. With one hand on the telescope optical tube, loosen the

Dec. lock knob. The telescope should now be able to

rotate freely about the Dec. axis. Loosen the tube ring

clamps a few turns, until you can slide the telescope tube

forward and back inside the rings (this can be aided by

using a slight twisting motion on the optical tube while

you push or pull on it) (Figure 4c).

6. Position the telescope so it remains horizontal when you

carefully let go with both hands. This is the balance point

(Figure 4d). Before clamping the rings tight again, rotate

the telescope so the eyepiece is at a convenient angle for

viewing. When you are actually observing with the tele-

scope, you can adjust the eyepiece position by loosening

the tube rings and rotating the optical tube.

7. Retighten the tube ring clamps.

The telescope is now balanced on both axes. Now when you

loosen the lock knob on one or both axes and manually point

the telescope, it should move without resistance and should

not drift from where you point it.

Focusing the Telescope

With the 25mm Sirius Plössl eyepiece in the focuser, move

the telescope so the front (open) end is pointing in the gen-

eral direction of an object at least 1/4-mile away. Now, with

your fingers, slowly rotate one of the focusing knobs until the

object comes into sharp focus. Go a little bit beyond sharp

focus until the image just starts to blur again, then reverse

the rotation of the knob, just to make sure you’ve hit the

exact focus point.

If you have trouble focusing, rotate the focus knob so the

drawtube is in as far as it will go. Now look through the eye-

piece while slowly rotating the focus knob in the opposite

direction. You should soon see the point at which focus is

reached.

Do You Wear Eyeglasses?

If you wear eyeglasses, you may be able to keep them on

while you observe, if your eyepieces have enough “eye relief”

to allow you to see the whole field of view. You can try this

by looking through the eyepiece first with your glasses on

and then with them off, and see if the glasses restrict the

view to only a portion of the full field. If they do, you can eas-

ily observe with your glasses off by just refocusing the tele-

scope the needed amount.

Aligning the Finder Scope

The finder scope (Figure 3a) must be aligned accurately with

the telescope for proper use. To align it, aim the main tele-

scope in the general direction of an object at least 1/4-mile

away, such as the top of a telephone pole, a chimney, etc. Do

this by first loosening the R.A. and Dec. lock knobs. Position

the telescope so the object appears in the eyepiece’s field of

view and then retighten the R.A. and Dec. lock knobs. Use

the slow-motion control cables to center the object in the

eyepiece.

Now, look in the finder scope. Is the object visible? Ideally,

it will be somewhere in the finder’s field of view. If it is not,

some coarse adjustments of the two black nylon finder scope

alignment thumb screws will be needed to get the finder

scope roughly parallel to the main tube.

Note: The image in both the finder scope and the main

telescope will appear upside-down (rotated 180°). This is

normal for finder scopes and reflector telescopes (see

Figure 5).

By loosening or tightening the alignment thumb screws, you

change the line of sight of the finder scope. Continue making

adjustments to the alignment thumb screws until the image in

both the finder scope and the telescope’s eyepiece is exactly

centered. Check the alignment by moving the telescope to

another object and fixing the finder scope’s crosshairs on

the exact point you want to look at. Then look through the

telescope’s eyepiece to see if that point is centered in the

field of view. If it is, the job is done. If not, make the neces-

sary adjustments until the two images match up.

The finder scope alignment needs to be checked before

every observing session. This can easily be done at night,

before viewing through the telescope. Choose any bright

star or planet, center the object in the telescope eyepiece,

and then adjust the finder scope’s alignment screws until

the star or planet is also centered on the finder’s crosshairs.

The finder scope is an invaluable tool for locating objects in

the night sky; its usage for this purpose will be discussed

later, in detail.

When transporting the telescope, we recommend removing

the finder scope and bracket from the tube. This is done by

simply loosening the thumbscrew on the dovetail slot.

Store the finder scope and bracket in an appropriate eye-

piece/accessory case.

Naked-eye view

View through finder scope and telescope

Figure 5. The view through a standard finder scope and reflector

telescope is upside down. This is true for the SpaceProbe 130ST

and its finder scope as well.

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Orion SPACEPROBE 130ST EQ Manuel d'utilisateur Page 6

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