Bedienungsanleitung Bresser AR-90 (Seite 30 von 44) (Englisch)

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ap p e n d I x c: po l a r al I G n m e n t

Looking at or near the Sun will cause instant and irreversible damage to your eye!

* Optional accessory for Exos 2

Appendix C: Polar Alignment

The Polar Alignment Viewfinder

Normally, a rough alignment with the celestial pole is sufficient for visual

purposes. However, for those observers who need to meet the more

demanding requirements of astrophotography, the polar alignment

viewfinder allows the telescope mount to be more precisely aligned with

true North. The Exos2 Mount can be equipped with a red LED illumination

for the finder scope (available separately).

Adjusting the polar viewfinder (EXOS 2 only)

A: Calibrating the month circle at the polar viewfinder scope (best done

while daytime)

1. Point the viewfinder against a bright surface (not in any case at the

sun!) and see the scaled line with the center cross (Fig. 36). Turn the

viewfinder’s eyepiece until the scales are focussed.

2. Now turn the month circle against the viewfinder until the 1st of May hits

the vertical line. The month circle is secured by a counterring; it should

be able to be turned but it should not come loose. Now you can put the

viewfinder back into the RA axis.

3. On the month circle, there’s a second scale, marked “E 20 10 0 10 20

W”. Take a white pencil and mark the point on the viewfinder that is right

above the “0”. This can be also done by using a small piece of colored

tape.

B: Aligning the viewfinder’s optical axis to the RA axis

1. Starting at the polar home position (see p. 18), loosen the Dec lock, turn

the Dec axis by 90° and re-engage the Dec lock again. In this position,

the optical axis of the viewfinder is free.

2. Point the viewfinder at a terrestrial objekt like a phone pole, the tip of a

church tower or equiv. so that it lines up with the center cross of the reti-

cle.

3. Ascertain whether the object moves out of the center cross when the

mount is rotated around its Dec axis.

4. If this is the case, correct 50% of the error by adjusting the hex screw of

the viewfinder holder. Now correct the remaining error by repositioning

the mount. Turn the RA axis by 90 / 180° and repeat this process until

the center cross stays on the desired object.

Polar alignment by using the polar viewfinder

(EXOS 2 only)

1. Set the polar home position (p. 18). Loosen the Dec lock, turn the Dec

axis by 90° and re-engage the lock.

2. Loosen the RA lock (33, Fig 1 d)

3. Remove the dust caps

4. If not done yet, remove the isolaton pad from the viewfinder’s illumination

(see p. 10, step 13).

5. Turn the illuminator switch clockwise to a comfortable brightness and

look throug the viewfinder. If necessary, focus the viewfinder until reticle

and stars appear sharp.

6. In the following step 7, use the latitude adjustment screws (Fig 1 d, 26)

and the azimuth adjustment screws (Fig 1 d, 27) to do the necessary fine

adjustments

Fig. 36: The view inside the polar

alignment viewfinder reticle (the

four stars show an association

near the southern celestial pole)

Fig. 35: The polar alignment

viewfinder*

Reticle LED

knob

Eyepiece

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