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Ray - looking at Justins images, I would imagine that you could get the appearance of an offset primary from a couple of sources:
1. If the primary itself is actually tilted
2. If the primary is not centred in the tube
3. and in the case of a truss design, if the top part of the tube is offset relative to the base due to misalignments in the trusses?
Are you able to tell using this tool which one it is?
BTW looks like a handy addition to the standard collimation tools!
Adam
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