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Here are some pictures that may help. The first one is a drawing for a 127/1500 refractor. The field size is 42mm at the left. The aperture is 127mm at the right.
The horizontal distance of 1500mm is compressed. That is to say the drawing is 1/1 scale in the vertical dimensions but 1/6 scale in the horizontal dimensions.
That enables you to measure the ID of the baffles for any position along the tube.
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