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17
If a ZEQ25GT mount equipped with an iOptron’s AccuAligning
TM
polar scope, you can do a fast and
accurate polar axis alignment with iOptron’s Quick Polar Alignment procedure.
Figure 17. Polar Scope
Polar Scope LED
Figure 18. Polar Scope LED
As indicated in Figure 17, the Polar Scope Dial has been divided into 12 hours along the angular
direction with half-hour tics. There are 2 groups, 6 concentric circles marked from 36’ to 44’ and 60’ to 70’,
respectively. The 36’ to 44’ concentric circles are used for polar alignment in northern hemisphere using
Polaris. While the 60’ to 70’ circles are used for polar alignment in southern hemisphere using Sigma
Octantis.
Quick Polar Alignment
(1) Level the ZEQ25 mount and set it at Zero Position. Make sure the telescope is parallel to the pole
axis (R.A. axis) of the mount. If a finder scope is used, adjust it to be parallel to the telescope
optical axis. Take off the Polar Axis Cover and Polar Scope Cover.
(2) Connect polar scope LED cable between Reticle plug located on the main unit and the LED socket
at the bottom of the DEC axle, as shown in Figure 18. The light intensity can be adjusted using the
HC via “Set Polar Scope Light” function under “Set Up Controller” menu.
(3) Turn on the mount power by pressing the On/Off switch on the main unit. Make sure that the time
and site information of the hand controller is correct. Press the MENU button, then select “Align”
and “Pole Star Position” to display the current Polaris position. For example, on May 30, 2010,
20:00:00 in Boston, United States (Lat N42º30’32” and Long W71º08’50”, 300 min behind UT,
DST set to Y), the Polaris Position is 1hr 26.8m and r = 41.5m, as shown in Figure 19 (a).
(4) Look through the polar scope to find the Polaris. Using Azimuth Adjustment Knob and Latitude
Adjustment Knob to adjust the mount in altitude and azimuth directions and put the Polaris in the
same position on the Polar Scope Dial as indicated on the HC LCD. In this case, the Polaris will be
located at a radius of 41.5’ and an angle of 1 hour 26.8 minute, as shown in Figure 19 (b).
(a) (b)
Figure 19. Polaris Position shown on HC (a) and where to put on polar scope dial (b)