Practical measurement of cell-phone camera lens focal length

Tom D. Milster; William P. Kuhn

doi:10.1117/12.2570622

20 August 2020 Practical measurement of cell-phone camera lens focal length

Tom D. Milster, William P. Kuhn

Proceedings Volume 11488, Optical System Alignment, Tolerancing, and Verification XIII; 1148807 (2020) https://doi.org/10.1117/12.2570622
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

A practical instrumentation configuration for measuring focal length of cell-phone camera lenses is presented that uses a custom autocollimator, a grating, an autostigmatic microscope, and a precision stage. Uncertainty in LED wavelength is reduced by using a white LED and a set of narrow-band filters. The autocollimator is designed to allow for rapid focus adjustment at each test wavelength. Examples of the measurement technique and an error analysis are provided.

Conference Presentation

Citation Download Citation

Tom D. Milster and William P. Kuhn "Practical measurement of cell-phone camera lens focal length", Proc. SPIE 11488, Optical System Alignment, Tolerancing, and Verification XIII, 1148807 (20 August 2020); https://doi.org/10.1117/12.2570622

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