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I have only occassionally had trouble getting a guide star using a MMOAG at 3 metre focal length. Sometimes it has meant moving the object from centre of the image off to one side. I don't rotate anything, simply use the joystick to move the scope a bit to one side or the other too look for a guide star. You can also increase the guide exposure length to bring up dim stars if your mount can handle it.
Greg.
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