iOptron CEM40 Instruction Manual page 22


Download and install iPolar Software (first time use)

Connect a USB cable between the mount and a computer USB port

Start polar alignment by following on screen instructions
Polar Alignment Software
There are quite a few alignment software available for polar alignment, such as PHD2 guiding,
TheSky software, PemPro, or Alignmaster.
BrightStar Polar Alignment
BrightStar Polar Alignment allows you to perform coarse polar align the mount even if you cannot
view the Celestial Pole.
(1) Level the mount and set it to the Zero Position. Align the telescope to the R.A. axis of the mount.
If a finder scope is used, adjust it to be parallel to the telescope optical axis.
(2) Use the HC (MENU => "Alignment" => "Polar Iterate Align") to display the azimuth and altitude
position of several bright stars near the meridian. Select one that is visible at a high altitude as
Alignment Star A. Follow the HC instruction to move Alignment Star A to the center of the
eyepiece using a combination of the Latitude Adjustment Knob and the "◄" or "►" buttons.
Press ENTER to confirm when the star is centered. Next, select a bright star that is close to the
horizon as Alignment Star B. Center it using the Azimuth Adjustment Knob and the "◄" or "►"
button (the "▲" and "▼" buttons are not used here). Press ENTER to confirm the settings.
(3) The telescope will now slew back to Alignment Star A. Repeat the steps above. The iteration can
be stopped when it is determined that the alignment error has been minimized. Press the BACK
button to exit the alignment procedure.
NOTE: It is highly recommended to use an eyepiece with an illuminated crosshair for accurate centering.
NOTE: The movement of the alignment star in your eyepiece may not be perpendicular depending on its
location in the sky.
STEP 12. Returning the Mount to Zero Position
After polar alignment and balancing OTA, return the mount to the Zero Position. Please check the
zero position after set up the mount or firmware update.
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