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I can say I'll never go back to a guide scope with any scope over 70mm in diameter. I have used an OAG with an FSQ106 and found it easy to setup. Guiding then is devoid of differential flexure. Even a 60mm scope would work with this solution. Just watch out for the image circle. You'll need enough room to allow the prism to be in the image circle and to be out of the way of the sensor. That will not likely be possible with a large sensor. It would then be the only time you would need to use a guide scope.
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