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03-14-2011, 11:05 AM   #1
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what does MTF stand for ?

( as in lens testing data) ? and why is it significant?

03-14-2011, 11:10 AM - 1 Like   #2
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Understanding Lens Contrast

What is an MTF Chart?

Basically, how lenses are evaluated is by looking at how well they transmit evenly spaced lines of black and white; ten, 20, or 30 "line pairs per millimeter" (lp/mm) means exactly what it says. As these lines get more and more closely spaced, the "noise" between them blurs the edges and makes the black lines look dark gray and the white lines look light gray to the lens (and also to your eye, especially as you get farther away). As the lines get closer and closer together, pretty soon the lens canşt distinguish them tonally, and the lens "sees" one undifferentiated gray. This ability on the part of the lens, charted graphically, is what MTF, or Modulation Transfer Function, is all about.

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