9
5. To restore the mount to Equatorial mode, loosen the
altitude lock knob first, then fully release the Altaz mode
lock knob.
DO NOT FORGET TO DO THIS! Use the
spring-loaded elevation adjustment handle to lower the
mount to the desired elevation.
Note:
• In any case, DO NOT TURN THE HANDLE
FORCEFULLY.
• In Altazimuth mode with one telescope mounted, the
telescope should be positioned on the right-hand side
of the mount when viewed from behind the mount. The
counterweight shaft should be extended to the left.
• When switching between Altazimuth and Equatorial
modes, be sure to remove the telescope (first) and all
counterweights (after scope has been removed) from
the mount to avoid damage to the mount’s latitude
adjustment mechanism.
• It may be more difficult to balance the R.A. (or Azimuth)
axis in Altazimuth mode. Here are the balancing steps
recommended for Altazimuth mode:
»
Balance the payload and counterweights in equato-
rial mode and mark the position of the counterweights.
»
Unload the payload and counterweights to set the
mount in Altazimuth mode.
»
Re-load the mount again by installing the counter-
weights at the marked position.
3.5 Mounting a second telescope (altazimuth
mode only)
A secondary telescope saddle is included with the Sirius Pro
mount. It’s designed to be installed on the end of the mount’s
counterweight shaft to hold a second telescope.
1. Slide the counterweight shaft out and rotate it so the flat
strip at the end of the shaft is facing up, then lock the
shaft with the two lock knobs
(Figure 18A).
2. Loosen the Allen screw on the secondary saddle’s silver
coupler ring and push the saddle onto the counterweight
shaft, as shown in
(Figure 18B) . Align the Allen screw
with the flat strip on the counterweight shaft.
3. Use a 5mm Allen wrench to secure the saddle to the
counterweight shaft with the Allen screw in the center of
the saddle
(Figure 18C). Also tighten the Allen screw on
the coupler ring with the same wrench.
4. Tighten the Dec. clutch wheel, and then install the
second telescope on the secondary saddle. The second
telescope and its saddle should be situated to the left of
the mount when the telescope points forward.
5. Loosen the counterweight shaft’s lock knobs to test the
balance of the second telescope. Adjust the positioning
of the telescope in its tube rings or the dovetail bar’s
position in the groove of the saddle until the telescope
is balanced. Then retighten the two counterweight shaft
lock knobs.
6. Loosen the Dec. clutch to check the balance of the
telescope mounted on the primary saddle. Make any
adjustments needed, then retighten the Dec. clutch
wheel.
Figure 16.
The altazimuth mode lock knob secures the
mount in position for use in altazimuth mode.
Figure 17.
All set for single scope use in altazimuth mode.
Altazimuth
mode lock
knob
Summary of Contents for Sirius Pro AZ/EQ-G
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