There have been unsubstantiated claims of how Rodenstock computes MTF curves with some claiming that the MTF curves are design points rather then actual performance curves. Obviously this is not a sensible approach to making curves available so we asked Rodenstock for their comments.
Their response is:
"calcuted. The reality is when you measure MTF curves on the MTF machine with a lens it could have a tolerance of -10 % at the most. In other words there is a difference when you measure the MTF together with the lens."
Hopefully this response will end the misguided, unsubstantiated and uneducated claims of theoretical curves.
Editor: See followup at http://hv.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=004ZdS
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