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The problem with using the Gstar as a guide camera is that while you can view it on your screen, you then need to get your PC to talk to you mount to issue guide commands (thats the little guide port on the side of the mount). To do this you need yet another adapter to convert PC signals to guide port signal, this device is called the GPUSB.
If you use the QHY5 or Starshoot Autoguider (SSAG), it has the guide port connector as part of the camera, so you just connect PC to camera, camera to guide port.
PHD Guiding is a good easy to use guide application, just click on the star on your computer screen and select guide. The 80mm guide scope with this QHY5/SSAG gives about a 1deg FOV so you can pretty much always find a guide star, even in the city.
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