Measuring Lenses Objectively by Dr. Hubert Nasse | Part 2
In the first part of this article – Dr. Hubert Nasse, Senior Scientist of the Carl Zeiss AG, gave an answer to the question “Why do we need MTF curves?”
We have already seen how the shape of the point images as determined by the aberrations and diffraction on the one hand correlates with the
modulation transfer on the other. We also encountered the various graphical depictions of the MTF, and I showed you four different basic types of transfer functions in the chapter on contour sharpness and image contrast.
Basically, we have learned the basics of how to read MTF curves, but all this is a bit theoretical considering that images are what really matters. In this article, we will therefore be examining MTF curves within the actual image.
To do this, we will look at three different motifs each of which were imaged using twelve different transfer functions. Obviously, these images must be available at sufficiently high resolution, so instead of including them in this text they are available for you to download from our server. The PDF includes the MTF curves relating to the images as well as additional explanations.
Read the full article here.
Download the pictures mentioned in the article here..