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Bresser AR-90 Manual

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te l e s c o p e fe at u r e s
Looking at or near the Sun will cause instant and irreversible damage to your eye!
6
the focuser assembly. For normal observing with an eyepiece and diago-
nal prism, it is not necessary to use the lock knob.
17 Dec. Lock: Controls the manual movement of the telescope. Turning the
Dec. lock counterclockwise unlocks the telescope enabling it to be freely
rotated by hand about the Dec. axis. Turning the Dec. lock clockwise (to
a firm feel only) tightens the lock and prevents the telescope from being
moved free, but engages the manual Dec. drive shaft.
18 Polar Viewfinder Cap (for EXOS2 models only): Remove this cap when
using the polar viewfinder (see 29).
19 Declination (Dec.) Setting Circle: See APPENDIX A, page 25, for more
information.
20   Counterweight Shaft Base: Thread, along with the shaft, to the mount.
See page 9 (Exos1) or 12 (Exos2) for more information.
21 Counterweight and Counterweight Lock Knob: Counterbalances the
weight of the optical tube, and adds stability to the mount. Tighten the
lock knob on the side of the counterweight to a firm feel to prevent the
weight from sliding on the shaft.
22 Counterweight Shaft: Slide the counterweight onto this shaft (see 21).
23 Counterweight Safety Cap: Prevents the counterweight from
accidentally slipping off the end of the counterweight shaft.
24 R.A. manual Drive Assembly:
26 Latitude Adjustment: Sets the latitude of your observing location. The
two T-handle screws work in a “push-pull” operation - as you tighten 
one, loosen the other. The T-handle above the azimuthal control knobs
(see 27) is the north T-handle screw (south in the southern hemi-
sphere). This side of the mount must be pointed north (south in the
southern hemisphere) during the polar alignment procedure.
With EXOS 1 Mounts, there’s only one latitute screw but the adjustment
is similar to the EXOS 2 models.
27 Fine Azimuth Control Knobs: Fine tune the side-to-side movement of
the telescope when centering Polaris in the telescope eyepiece or when
using the polar alignment viewfinder.
28 Latitude Dial: Set the latitude of the observing site on this dial using the
latitude T-handle screws. For more information see Step 6, page 9.
29 Polar Alignment Viewfinder (EXOS 2 only): Allows you to precisely polar
align the telescope.
30 Polar Alignment Viewfinder Reticle and LED Knob (EXOS 2 only):
Rotate the knob to switch on or off the LED that illuminates the reticle
within the polar alignment finder. Be sure to turn off the LED when 
finished with the polar viewfinder. Powered by (factory-supplied)
batteries contained within. Polar viewfinder LED illumination is available
seperately.
31 Right Ascension (R.A.) Setting Circle: See APPENDIX A, page 25.
32 R.A. Setting Circle Lock Knob: Rotate the knob to lock the R.A. Setting
Circle in place.
33 R.A. Lock: Controls the manual movement of the telescope. Turning the
R.A. lock counterclockwise unlocks the telescope enabling it to be freely
rotated by hand about the R.A. axis. Turning the R.A. lock clockwise (to
a firm feel only) tightens the lock and prevents the telescope from being
moved free, but engages the R.A. manual shaft.
34 DEC - manual drive assembly
35 Tripod Leg Adjustment Knobs: Tighten to a firm feel to secure tripod
legs.
36 Variable Height Tripod Legs: Supports the telescope mount. The mount
attaches to the top of the tripod.
37 Accessory tray: Set extra eyepieces and other accessory on this
convenient tray.
38
Tripod Leg Braces: Make the tripod more secure and stable. See Fig. 3.
1&
Important:
Before loosening the DEC lock, 
hold the optical tube in place;
otherwise it might swing through
and cause damage to the mount
or even hurt the operator.
2&
Want to learn more about
adjusting the latitude scale?
See p. 15, step 6.
DEFINITION:
In this manual, you will find the
terms “right aszension (RA), 
Declination (DEC), Elevation
and Azimut”. These terms are 
explained on p. 25
2(
Want to learn more about the
polar finder? See p. 30.
… 6 …


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