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Hi Chris,
You can use just about any sort of optics for the guide scope, my first was a 70-300mm zoom camera lens. As long as the camera attached can achieve focus and you can mount it steadily on you scope.
Your camera though is probably more important, most guiding software will not talk to DSLRs. So you will probably want to look at potential guide cameras and see what software is supported by it.
One of the most popular is the QHY5/Orion SSAG (essentially the same beasts). Relatively cheap, reliable and supported by every man and his dog from a software perspective. It also has the benefit of inbuilt guide port, so it will talk straight to your CG5s guide port.
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