19 May 2003 Centration errors: that's great, but…
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The optical axis of a spherical lens is the axis passing through the two centers of curvature of the optical surfaces. It is such a simple thing to describe. However, detecting where the axis is and positioning it can be as complex as the definition is simple. Make one or both of the surfaces aspheric and it gets even harder.
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Brandon Light, Brandon Light, } "Centration errors: that's great, but…", Proc. SPIE 10314, Optifab 2003: Technical Digest, 103140J (19 May 2003); doi: 10.1117/12.2284008; https://doi.org/10.1117/12.2284008

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