Demanding consumer digital imaging applications require excellent aberration correction during optical zoom. Objectshifting in an optical system induces astigmatism that depends on the spherical aberration of the pupil. Although a zoomlens also refocuses and changes optical power for different configurations, obtaining the simplest configurations withastigmatism correction also requires correction of the spherical aberration of the pupil. Analysis of image quality forthese factors should include focal corridor assessment across the field-of-view using an appropriate metric such asthrough-focus MTF. This paper discusses zoom lens correction and analysis based on these principles that enablesquality consumer digital imaging products.
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