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Proceedings Paper

Internal structure of bokeh image in camera lenses with aspheric surfaces
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Paper Abstract

We present theoretical, numerical and experimental analysis of the cause of internal structure of bokeh images often seen in shots taken with camera lenses that incorporate aspheric surfaces. The bokeh structure was shown to closely reflect characteristics of the asphere manufacturing process, and found to be due to light diffraction on the phase grating associated with the aspheric surface. Results of theoretical analysis were confirmed by numerical simulations and experimental photo shots. Bokeh images were found to be more sensitive to residual manufacturing artifacts of aspheric surface than corresponding degradation in lens modulation transfer function for a sharp focused image.

Paper Details

Date Published: 25 September 2013
PDF: 14 pages
Proc. SPIE 8841, Current Developments in Lens Design and Optical Engineering XIV, 88410O (25 September 2013); doi: 10.1117/12.2023092
Show Author Affiliations
V. P. Sivokon, Raytheon ELCAN Optical Technologies (Canada)
M. D. Thorpe, Raytheon ELCAN Optical Technologies (Canada)

Published in SPIE Proceedings Vol. 8841:
Current Developments in Lens Design and Optical Engineering XIV
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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