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Proceedings Paper

Portraiture lens concept in a mobile phone camera
Author(s): Conor J. Sheil; Alexander V. Goncharov
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Paper Abstract

A small form-factor lens was designed for the purpose of portraiture photography, the size of which allows use within smartphone casing. The current general requirement of mobile cameras having good all-round performance results in a typical, familiar, many-element design. Such designs have little room for improvement, in terms of the available degrees of freedom and highly-demanding target metrics such as low f-number and wide field of view. However, the specific application of the current portraiture lens relaxed the requirement of an all-round high-performing lens, allowing improvement of certain aspects at the expense of others. With a main emphasis on reducing depth of field (DoF), the current design takes advantage of the simple geometrical relationship between DoF and pupil diameter. The system has a large aperture, while a reasonable f-number gives a relatively large focal length, requiring a catadioptric lens design with double ray path; hence, field of view is reduced. Compared to typical mobile lenses, the large diameter reduces depth of field by a factor of four.

Paper Details

Date Published: 27 November 2017
PDF: 6 pages
Proc. SPIE 10590, International Optical Design Conference 2017, 105901X (27 November 2017);
Show Author Affiliations
Conor J. Sheil, National Univ. of Ireland, Galway (Ireland)
Alexander V. Goncharov, National Univ. of Ireland, Galway (Ireland)

Published in SPIE Proceedings Vol. 10590:
International Optical Design Conference 2017
Peter P. Clark; Julius A. Muschaweck; Richard N. Pfisterer; John R. Rogers, Editor(s)

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