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Silv, notice in Logan's image the "lighthouse effect" as it is known, is NOT present over the entire image, notable not the bright central stars. This is indicitive of it NOT being collimation screws or similar, and is more than likely an artefact of a little tilt (top left), not QUITE flat (the flattener was not designed for such a large sensor) and also most likely a small intrusion into the light path by the OAG's prism or prism housing (a common issue). notice the Lighthouse ONLY appears on the right side.
If Logan had used a camera with a slightly smaller sensor, you would not see these artefacts.
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