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. 2013 Jan 18;4(2):287–297. doi: 10.1364/BOE.4.000287

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©2013 Optical Society of America

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially.

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Fig. 6 — (a) The center of a hi-resolution 1951 USAF target illuminated with white light in transmission. The achromatic objective is operating in reverse, which means the resolution is limited by the image space NA = 0.14. (b) The region of interest outlined in (a). The smallest resolvable feature is group 8, element 5, which has a spatial frequency of 406 lp/mm. The theoretical diffraction limit is 417 lp/mm. (c) Set of four edges measured with the slanted edge method to determine the achromatic objective’s MTF and Strehl ratio.