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Some interesting thoughts. I have tried using OAG's in the past but it did not work that well.
However, the QSI comes with one installed onto it and will be using it to guide my scope. Theo is correct on errors being recorded on longer focal length main scopes before the guide scope records the problem. Sorting flexure issues can be very tiresome, it means spending a lot on very solid mountings too. So this is where OAG guiding comes into its own. If you think about it SBIG self guided camera's work on the same principle. It plucks off some light and uses this to guide with. I would say a really good OAG is what you should buy if you are going to get one. Buy the best, that way you are assured of the best results.
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