MTF is a common term used when sharpness from a lens is to be measured.
What is MTF?
A bit of effort to write it up
MTF = Modulation Transfer Function
and here: http://www.normankoren.com/Tutorials/MTF.html and
Last edited by Nenjia; 30th May 2009 at 10:00 PM.
A very nice article about MTFs, how to read them and how not to...