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I suppose if you think about it, it makes sense that moving it would affect the focus. The prism will be picking up light from the same distance in front of the image plane but the distance from that point to the guide camera sensor will change.
My thinking with moving it in was that this system is fairly fast at f5.6 and I am thinking that you are more likely to pick up a suitable star the closer to the optical axis you are.
Thanks for the advice guys!!
Malcolm
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