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I know the focal plane position is marked on the camera body, but what is the exact measurement of the focal plane from the front lens seating face of the SA Mount ?
Optically this is true but physically it isn't. The IR filter and microlenses have refractive indexes so the physical distance must be longer than 44mm to compensate.
So if you are making a optical calculation as in a pinhole camera yes the optical distance of 44mm should be used.
But if you are designing a panoramic pan head, then the physical distance should be used, as marked on the camera.
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