June 2019
Beginner
156 pages
4h 59m
English
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27. MTF CHARTS
ONE OF THE easier ways of judging the sharpness of a given lens is with an MTF (Modulation Transfer Function) chart. These charts are often distributed by the lens manufacturer when a new product is introduced. These charts indicate the level of sharpness at different apertures, in different parts of the lens, and with different types of contrast.
However, the system of generating the MTF charts has a few flaws. Firstly, the charts are usually theoretical; the data has been derived from technical specification regarding the lens elements, shape, construction, and coatings, and not necessarily from actual photographic tests. It speaks ...
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