Balancing The Telescope - Dörr DANUBIA DELTA 20 Notice D'utilisation

07.3

BALANCING THE TELESCOPE

The telescope should be balanced before each observing session. Balancing reduces stress on the mount and
allows precise micro-adjustment control. A balanced telescope is especially critical when using the optional
clock drive for astrophotography. The telescope should be balanced after all accessories (eyepiece, camera,
etc.) have been attached. Before balancing your telescope, make sure that your tripod is in a balanced level
and on a stable surface. For photography, point the telescope in the direction you will be taking photos before
performing the balancing steps.
R.A. Balancing
For best result, adjust the altitude of the mount to between 15° and 30° if possible by using the altitude
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adjustment T-bolt.
Slowly unlock the R.A. and DEC. lock knobs. Rotate the telescope until both the optical tube and counter-
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weight rod is horizontal to the ground, and the telescope tube is to the side of the mount. (Fig.c)
Tighten the DEC. lock knob.
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Move the counterweight along the counterweight rod until the telescope is balanced and remains sta-
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tionary when released.
Tighten the counterweight thumb screw to hold the counterweight in its new position.
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DEC. Balancing
All accessories should be attached to the telescope before balancing around the declination axis. The R.A.
balancing should be done before proceeding with DEC. balancing.
For best results, adjust altitude of the mount to between 60° and 75° if possible.
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Release the R.A. lock knob and rotate around the R.A. axis so that the counterweight rod is in a horizontal
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position. Tighten the R.A. thumbscrew.
Unlock the DEC. thumbscrew and rotate the telescope tube until it is paralleled to the ground.
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Slowly release the telescope and determine in which direction it rotates. Loosen the telescope tube rings
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and slide the telescope tube forward or backward in the clamps until it is balanced.
Once the telescope no longer rotates from its parallel starting position, re-tighten tube rings and the DEC.
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lock knob. Reset altitude axis to your local latitude.
Operating the EQ1-Mount Delta 20, Wega 900
The EQ1 mount has controls for both conventional altitude (up-down) and azimuth (left-right) directions of
motion.These two adjustments are suggested for large direction changes and for terrestrial viewing. Use the
large knurled knob located underneath for azimuth adjustments. Loosen the knob and rotate the mount head
around the azimuth axis. Use the altitude adjustment T-bolts for altitude adjustments (Fig.d). In addition, this
mount has Right Ascension (hour angle) and declination direction controls for polar-aligned astronomical
observing. Loosen the lock knobs to make large direction changes. Use the control cables for fi ne adjustment
after the lock knobs have both been locked (Fig.d1). An additional scale is included for the altitude axis. This
allows polar alignment for your local latitude. (Fig.d2)
Operating the EQ2-Mount Delta 30, Saturn 50
The EQ2 mount has controls for both conventional altitude (up-down) and azimuth (left-right) directions of
motion. These two adjustments are suggested for large direction changes and for terrestrial viewing. Use the
large knurled knob located underneath for azimuth adjustments. Loosen the knob and rotate the mount head
around the azimuth axis. Use the altitude adjustment T-bolts for altitude adjustments (Fig.e). In addition, this
mount has Right Ascension (hour angle) and declination direction controls for polar-aligned astronomical
observing. Loosen the lock knobs to make large direction changes. Use the control cables for fi ne adjustment
after the lock knobs have both been locked (Fig.e1). An additional scale is included for the altitude axis. This
allows polar alignment for your local latitude (Fig.d2).
CAUTION!
Observations of the sun are extremely dangerous. Do not use this telescope for sun observation. The optical
elements have the e ects of a burning glass and will blind you! The ideal way to make safe sun observations
is the usage of a special sun fi lter foil, which is fi xed at the front end of the telescope. The foil absorbs 99.9%
of the sunlight.
Fig.c
Fig.d
R.A. lock knob
Altitude adjustment
(up-down)
Fig.d1
DEC. Scale
Fig.d2
Fig.e
Fig.e1
DEC. Scale
R.A. scale
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Azimuth adjustment
(left-right)
DEC. lock knob
R.A. scale
R.A. fi ne
adjustment
Altitude adjustment
knob (up-down)
Azimuth lock knob
(left-right)
DEC. lock knob
R.A. lock knob
R.A. fi ne DEC. fi ne
adjustment adjustment
DEC. fi ne
adjustment