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No matter how you focus, the distance between the front of the primary and the imaging plane does not move. you're either adjusting the camera position to place the sensor within the focus zone, or moving the secondary to bring the focal plane to the camera. the physical distance between the primary and the imaging plain remains the same...
I remember reading a while back on the RC design, the distance between the rear of the primary and the focal plane is critical, I don't quite understand how however..
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