Definition of Hartmann test

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Photonics Dictionary

Hartmann test: A test for spherical aberration, coma or astigmatism in which incident rays from a point source are isolated by small holes in a metal disc located close to the lens or mirror under test. Photographic plates are inserted into the beam within and beyond the focal region, and the black dots on the exposed plates are measured to enable the exact focus position of each lens zone to be calculated.

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