10
7. Loosen the counterweight shaft’s lock knobs and rotate
the second telescope until it points in the same direction
as the main telescope. Retighten the lock knobs.
8. Aim the main telescope at a distant object, and then
adjust the two vertical-adjustment knobs on the
secondary saddle
(Figure 19) to point the secondary
telescope to the same vertical level.
Figure 20 shows the mount in Altazimuth mode with the sec-
ondary saddle installed.
Note:
• Use the secondary saddle only when the Sirius Pro
mount is set up in Altazimuth mode.
• There is no mechanism on both the primary saddle and
the secondary saddle for aligning the two telescopes in
the azimuth direction.
• The 120mm counterweight shaft extension cannot be
used with the secondary saddle.
Part 4: Polar aliGnMEnt
When you look at the night sky, you no doubt have noticed that
the stars appear to move slowly from east to west over time.
That motion is actually caused by the Earth’s rotation (from
west to east). An equatorial mount is designed to compensate
for that motion, allowing you to easily “track” the movement of
astronomical objects, thereby keeping them from drifting out of
your telescope’s field of view while you’re observing or imag-
ing.
This “tracking” is accomplished by slowly rotating the telescope
on its right ascension (R.A.) axis, using the built in motor drive.
But first the R.A. axis of the mount must be aligned with the
Earth’s rotational (polar) axis—a process called polar align-
ment. The SynScan hand controller provides a highly accurate
polar alignment routine after a 2-star or 3-star GoTo alignment
is performed. Please refer to the SynScan manual for detailed
instructions.
An optional, externally mounted polar axis finder scope
(#7152) is available for the Sirius Pro mount. It can be used
to accurately polar align the mount from both Northern and
Southern Hemisphere locations. For detailed instructions on
how to set up and use the polar scope, refer to the manual for
that accessory.
Part 5: DriVE PanEl
intErFacE
5.1 Panel interface components:
POWER INPUT JACK: This is a threaded 12V DC power
input jack on the right side of the mount head that provides a
secure connection to the power source
(Figure 21). The 12V
DC “cigarette lighter” power cable provided with the mount has
a matching threaded connector for the input jack.
Refer to
Figure 22 for the following ports:
HAND CONTROL: This 8-pin RJ-45 jack is for connecting the
coil cable of the SynScan hand controller.
AUTO GUIDE: A 6-pin RJ-12 jack is for connecting an autogu-
ider. It is compatible with any autoguider with an ST-4 type
interface.
SNAP: These two 2.5mm stereo jacks allow connection to two
cameras’ shutter control ports. The SynScan hand controller
Figure 18.
For mounting a second telescope in Altazimuth
mode,
A) first locate the flat strip at the end of the
counterweight shaft.
B) Then install the included secondary
saddle on the shaft with the socket head screw over the flat
strip. Finally,
C) tighten the screw running through the center
of the secondary saddle.
Flat strip
Flat strip
Allen screw
a.
B.
c.
Содержание Sirius Pro AZ/EQ-G
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