Manual Bresser AR-152S-L (page 14 of 44) (English)

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Aligning the Viewfinder

The wide field of view of the telescope‘s viewfinder (4, Fig. 1a) provides

an easier way to initially sight objects than the main telescope‘s eyepiece

(3, Fig. 1a), which has a much narrower field of view. If you have not

already attached the viewfinder to the telescope tube assembly, follow

the procedure described in step 9, page 9.

In order for the viewfinder to be useful, it must be aligned to the main

telescope, so that both the viewfinder and telescope‘s optical tube (10, Fig.

1a) point at the same position in the sky. This alignment makes it easier to

find objects: First locate an object in the wide-field viewfinder, then look into

the eyepiece of the main telescope for a detailed view.

To align the viewfinder, perform steps 1 through 4 during the daytime;

perform step 5 at night. Both the 6 x 30mm and the 8 x 50mm viewfinders

align in an identical manner. Refer to Fig. 14.

1. Remove the dust covers from the optical tube and the viewfinder.

2. If you have not already done so, insert the low-power 25mm eyepiece

(3, Fig. 1b) into the eyepiece holder of the main telescope.

See step 10, page 13.

3. Look through the viewfinder eyepiece at an object at least one-half mile

away (Tip: Remove the viewfinder tube from the bracket to simplify this

operation). If the distant object is not in focus, turn the focus lock ring

counterclockwise to loosen the viewfinder front cell (6, Fig. 1b). Twist the

front cell until focus is achieved and retighten the focus lock ring.

4. Unlock the R.A. lock (33, Fig. 1d) and the Dec lock (17, Fig. 1d) so

that the telescope turns freely on both axes. Then point the main tel-

escope at a tall, welldefined and stationary land object (e.g., the top of

a telephone pole) at least 200 yards distant and center the object in the

telescope‘s eyepiece. Focus the image by turning the focus knobs (8,

Fig. 1b). Retighten the R.A. and Dec. locks.

5. Look through the viewfinder and loosen or tighten, as appropriate, one

or more of the viewfinder collimation thumbscrews (5, Fig. 1b) until

the viewfinder’s crosshairs are precisely centered on the object you

previously centered in the main telescope‘s eyepiece. You are now ready

to make your first observations with your telescope.

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

fI r s t st e p s

*Fig. 13a: Reticle LED assembly:

(A) Reticle container

(B) LED

(D) Battery holder

(E) Threaded lid

(F) On/off switch













Isolation pad

Typ 2x LR 44

*Fig. 13b: Before using the illumi-

nation for the first time, remove the

isolation pad (See Fig. 13a) from

the battery holder.

* Optional accessory for Exos 2

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Bresser AR-152S-L Manual

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