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My vote goes for OAG, since it eliminates a possible problem of flexing between the two focusers (guidescope and the OTA) plus possibly influence on guiding of some other mechanical factors such as slight mirror shift etc.
Can pixels be binned in your guide camera to improve sensitivity? A popular lodestar has pixels with nearly three times the surface area comparing to 174mm plus a similar QA, meaning lodestar could be two-three times more sensitive?
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