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I could be wrong here but wont your guide camera need to be larger than your imaging camera for this to give any advantage? The center of the image is going to be black and only the edges visible, If the "black" center of the image circle is the size of your imaging camera then the guide chip would need to be larger than that too see all of the guide stars. you could move the guide cam around to find the best star of the frame but this is already possible with conventional OAGs. Also this would presumably take up a large amount of back focus.
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