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iOptron® iGuiderTM Integreted Guiding System Instruction
iOptron iGuiderTM guiding system is an autoguiding system built inside a dovetail saddle of an iOptron
mount, such as CEM70G, CEM40G and GEM45G. It includes a 30mm diameter and 120mm focal length
guiding scope and a Windows based driverless guiding camera.
1. Focus adjuster locking screw (2mm hex), 2.Focus adjuster, 3.Lens cover
The iGuider only support ASCOM guiding. Please follow mount computer control reference to make sure
that a proper iOptron Commander/ASCOM Drive is installed based on your mount type.
CEM40G/GEM45G and CEM70G uses different Commander/ASCOM Drive. Test the mount computer
control before setup the autoguiding.
1. Connect iGuider to a PC
The iGuider guiding system is connected internally to the mount main USB port. For example, CEM70G is
connected to the USB3.0 port on the main control board.
Connect the mount to a PC via main USB port. Check your PC device list via Device Manager, you should
see an iOptron iGuider under the Camera.
2. Setup PHD2 Guiding
Download freeware PHD2 autoguiding software from https://openphdguiding.org/downloads/. Please
select V2.6.7 or later version.
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Start the PHD2 to start New Profile Wizard:
Select “iOptron iGuider” camera. PHD2 will fill the pixel size (3.75um) automatically. Enter 120mm into
guide scope focal length tab, and click Next.
If the program displays the following error, please exit “iOptron iPolar” software.
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Select correct iOptron ASCOM driver from the dropdown menu. Here “iOptron ASCOM Driver for
CEM120/70 Mount” was chosen for a CEM70G mount. Click Next.
In next Adaptive Optics Device setting window, select None and go to Next.
Save the Profile Name. Do not check Build dark library. You may do it at a late time. Click Finish to
complete the Profile setup.
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Connect all the devices.
To view the image via iGuider, check “Display Toolbar” and “Display Star Profile” in View menu.
Select proper “Exposure Time” in Main tool bar and click on “Continues Exposure”, you should see star
images in the main window. Make sure you remove the lens cover.
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3. iGuiding Focus Adjustment
Locking Screw
Focus Adjuster
If you are using the iGudier the first time, you may need to
adjust the guiding camera focusing.
Set up the mount. Connect the mount to a computer. Perform
polar alignment. Set the Zero Position.
To adjust iGuider focus:
(1) Remove iGuider lens cover.
(2) Run PHD2 software and select iOptron iGuider
(3) Go to a bright star
(4) Loosen Focus Adjuster Locking Screw 1. Then adjust the
Focus Adjuster 2 to bring the star to show in the main
window.
(5) Click on the star to look at the Star Profile. Further fine adjusting the Focus Adjuster to bring the
Peak to maximum value.
(6) Tighten the Locking Screw 1.
4. iGuiding Exposure Time Adjustment
When PHD2 has difficult to pick the guiding star due to a star in the interested area is not bright enough
or weather condition, one can adjust the camera exposure time. The camera exposure time change
won’t be kept when power is off.
The power on default exposure value is -13, or 0.01 seconds. To adjust it, click on PHD2 Guide =>
Camera Settings.
Adjust the camera Exposure time to -7 (one second), or other numbers from the reference table. Make
sure that the PHD2 exposure time and camera exposure time are set the same.
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Please refer to the following tables for exposure number and exposure time:
Guiding scope aperture
30mm
Focal length
120mm
Imaging sensor
1/3 in CMOS
Pixel size
3.75µm
Resolution
1280X960
Operation system
Windows (driverless)
Number
Exposure
-13
0.01s
-12
0.02s
-11
0.05s
-10
0.1s
-9
0.2s
-8
0.5s
-7
1.0s
-6
1.5s
-5
2.0s
-4
2.5s
-3
3.0s
-2
3.5s
-1
3.8s
5. Specifications
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