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Fast full-field modulation transfer function analysis for photographic lens quality assessment.

Bernard Delley, Frans van den Bergh

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    |March 10, 2021
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    This study presents a method for accurately measuring photographic lens performance using the slanted-edge technique. The developed process enables reliable, automated quality assessment of lens modulation transfer function (MTF) values.

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    Area of Science:

    • Optical engineering
    • Image quality assessment

    Background:

    • Full-field modulation transfer function (MTF) data is crucial for evaluating photographic lens performance.
    • Identifying lens shortcomings like decentering requires precise MTF measurements.

    Purpose of the Study:

    • To present a process for deriving accurate lens MTF from slanted-edge spatial frequency response measurements.
    • To enable reliable, automated quality assessment of photographic lenses.

    Main Methods:

    • Developed a comprehensive process including chart design, alignment, and data capture using digital cameras.
    • Implemented slanted-edge algorithm with sensor and chart MTF corrections.
    • Utilized full-field MTF measurements for analysis.

    Main Results:

    • Demonstrated high reliability of measured MTF values for automated quality assessment.
    • Achieved measurement accuracy of approximately 0.02 MTF and repeatability of less than 0.005 up to 100 cycles/mm.
    • Provided unambiguous numerical criteria for comparing measured MTF with lens design expectations.

    Conclusions:

    • The presented method reliably derives accurate lens MTF from slanted-edge measurements.
    • The process supports automated quality assessment with high precision and repeatability.
    • Full-field MTF data offers a clear criterion for lens performance evaluation against design specifications.