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Hi Marc. I've set the draw tube at the focal plane by focusing an image of some distant trees on a piece of grease proof paper held over the end of the draw tube. I'm not sure how else to determine this position as I'm using a paracor with the camera so the physical position of the image sensor is different. Not sure if this logic is correct?
I have the OTA sitting horizontal on a table with the focuser vertical so the autocollimator is sitting in the draw tube under its own weight so while not tight it should be sitting square. When I rotate the offset pupil I'm seeing a slight shift in the stacked hotspot images as shown in the last two photos.
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