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Measuring lenses objectively - Part 1:
Why do we need MTF curves? |
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MTF – these three letters are today a magic word with photographers and with anyone, who is interested in detail in the technical quality of his photographs. For decades, we from Carl Zeiss have been publishing the MTF curves of our lenses. Today, other manufacturers do so too. Also, it is possible to find similar data in numerous test reports, either in print or online.
There is ample discussion material.
But what exactly does MTF stand for? What is in reality behind terms, such as contrasts, sharpness, resolution capacity, local frequency, sagittal or tangential? And what does this actually have to do with photography? Does my picture look better if my lens has an MTF curve like the ones in the textbooks?
Dr. Hubert Nasse, Senior Scientist with Carl Zeiss AG, has exhaustively investigated this subject. Read on if you want to become an expert too.
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December 2008 |
Part 2 (in CLN 31)
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