7 March 2014 Out-of-focus point spread functions
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Abstract
There are many ways in which the performance of a lens can be characterized, most of which measure properties of the in-focus image. The current work instead centers on measuring properties of an out-of-focus (OOF) image. The image created by imaging a point of light is commonly known as the point spread function (PSF). We have found that by measuring the OOF PSF a great deal of otherwise unavailable information about the lens can be obtained. The current work presents observations and sample images from measurements made on a collection of over 125 lenses. A variety of the attributes than can be obtained from study of OOF PSFs, and some of their applications, are discussed.
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Henry Gordon Dietz, Henry Gordon Dietz, } "Out-of-focus point spread functions", Proc. SPIE 9023, Digital Photography X, 90230J (7 March 2014); doi: 10.1117/12.2040490; https://doi.org/10.1117/12.2040490
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