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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.
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Tom D. Milster, 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