For a 35mm lens the film/lens value 3cm seems curious to me? In the case of the HQ camera and the S8 film the optical calculation is especially simple, the magnification is approximately 1 and in this case the film/lens and lens/sensor distance are approximately equal to twice the focal length of the lens. The optical calculations are not very complicated and for an exact calculation I gave in a previous post an Excel calculation.
https://forums.kinograph.cc/t/c-mount-rpi-hq-camera-to-m39-componon-s-f2-8-extension-tube-for-3d-printing/2679/6?u=dgalland
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