Access to eBooks is limited to institutions that have purchased or currently subscribe to the SPIE eBooks program. eBooks are not available via an individual subscription. SPIE books (print and digital) may be purchased individually on SPIE.Org.

Contact your librarian to recommend SPIE eBooks for your organization.
Surface Sag and Conic Sections
During the process of optical system design and layout, it is often necessary to determine the depth, or sag, of an optical surface at some specific height (aperture radius). For example, consider the configuration of a simple lens cell, as shown in Figure G.1(a). In order to protect the glass from physical damage by assuring that the lens vertex does not extend outside the lens cell, it is necessary to determine the sag of the convex lens surface at the height designated Y.
Online access to SPIE eBooks is limited to subscribing institutions.

Back to Top