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Here's where I get confused. It's not like a newtonian in that the secondary isn't flat, so I wonder if the setup of the secondary (spacing and accuracy of it's figure) contributes to the final image as measured by the plate-solver. Kind of like if you tried to measure your focal length with a focal reducer in place.
IOW, Is the focal length of the system for plate solving *only determined by the primary or does the secondary play a part?
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