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

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Richard N. Youngworth and Ellis I. Betensky, "Designing astigmatism-corrected zoom lenses for digital consumer imaging," Proc. SPIE 11106, Zoom Lenses VI, 111060A (Presented at SPIE Optical Engineering + Applications: August 14, 2019; Published: 9 September 2019); https://doi.org/10.1117/12.2528473.