Dorr DANUBIA ATLAS 2000 Bedienungsanleitung Seite 20

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 the altitude of the mount to between 60° and 75° if possible.
•
Release the R.A. lock knob and rotate around the R.A. axis so that the counterweight rod is in a horizontal
•
position. Tighten the R.A. lock knob.
Unlock the DEC. lock knob and rotate the telescope tube until it is parallel to the ground.
•
Slowly release the telescope and determine in which direction it rotates. Loosen the telescope tube rings
•
and slide the telescope tube forward or backward in the rings until it is balanced.
Once the telescope no longer rotates from its parallel starting position, re-tighten the tube rings and the
•
DEC. lock knob. Reset the altitude axis to your local latitude.
07.4 USING THE LEVELING BUBBLE
For best telescope performance, the equatorial mount should be properly leveled. A level tripod allows easier
fine adjustment of controls and better weight distribution. This equatorial mount includes a small leveling
bubble near its base (Fig.d). Adjust the height of each tripod leg until the bubble appears in the center of the
circle. Note that the tripod legs may not be at same length when the equatorial mount is level.
07.5 OPERATING THE EQ3-2 MOUNT ATLAS 2000, SIRIUS 150
The EQ3-2 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. The two
azimuth adjustment knobs located near the tripod head allow fine-adjustment of azimuth for polar alignment.
Use the altitude adjustment T-bolts for altitude adjustments. These allow fine-adjustment for setting the
mount to your local latitude. (Fig.e). In addition, this mount has Right Ascension (hour angle) and Declination
direction controls for polaraligned astronomical observing. Loosen the lock knobs to make large direction
changes. Use the control cables for fine 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.e2).
07.6 OPERATING THE EQ5 MOUNT ORION 200
The EQ5 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. The two
azimuth adjustment knobs located near the tripod head allow fine-adjustment of azimuth for polar alignment.
Use the altitude adjustment T-bolts for altitude adjustments. These allow fine-adjustment for setting the
mount to your local latitude (Fig.f). In addition, this mount has Right Ascension (hour angle) and declination
direction controls for polaraligned astronomical observing. Loosen the lock knobs to make large direction
changes. Use the control cables for fine adjustment after the lock knobs have both been locked (Fig.f1). An
additional scale is included for the altitude axis. This allows polar alignment for your local latitude (Fig.e2).
07.7 USING THE BARLOW LENS
A Barlow is a negative lens which increases the magnifying power of an eyepiece, while reducing the field
of view. It expands the cone of the focussed light before it reaches the focal point, so that the telescope's
focal length appears longer to the eyepiece. The Barlow is inserted between the focuser and the eyepiece in
a reflector. With some telescopes, it can also be inserted between the focuser and the diagonal, and in this
position it gives even greater magnification. For example, a 2x Barlow when inserted after the diagonal can
become 3x when placed in front of the diagonal. In addition to increasing magnification, the benefits of using
a Barlow lens include improved eye relief, and reduced spherical aberration in the eyepiece. For this reason,
a Barlow plus a lens often outperform a single lens producing the same magnification. However, it is greatest
value may be that a Barlow can potentially double the number of eyepieces in your collection.
CAUTION!
Observations of the sun are extremely dangerous. Do not use this telescope for sun observation. The optical
elements have the effects of a burning glass and will blind you! The ideal way to make safe sun observations
is the usage of a special sun filter foil, which is fixed at the front end of the telescope. The foil absorbs 99.9%
of the sunlight.
Fig.d
Fig.e
Azimuth adjustment
(Left-Right)
Fig.e1
DEC. adjustment
Fig.e2
Fig.f
Azimuth adjustment
(Left-Right)
Fig.f1
DEC. adjustment
Fig.g
20
Leveling bubble
Altitude adjustment
(Up-Down)
DEC. fine adjustment
R.A.fine adjustment
R.A.adjustment
Latitude scale
Altitude adjustment
(Up-Down)
DEC. fine adjustment
R.A.adjustment
R.A.fine adjustment
Eyepiece
Barlow
Reflecting Telescope