| Shack-Hartmann wavefront sensor test of a telescope at Cassegrain focus |
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Setup:
A telescope tested at the Cassegrain focus using external parallel light. The aberrations of the SH system itself are removed by taking a
calibration frame, with a calibration source placed at the focus of Puntino. The incident light illuminating the
system should be aberration free. In the case of an astronomical telescope, a natural star is used.
It is not necessary to use parallel light for the test. The measured aberrations will then no longer refer to those for parallel light, but to one particular optical configuration that is used for the test.
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| Lenses |
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| Mirrors |
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Ophthalmic lenses |
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| Human eye |
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| Astronomical Telescopes |
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 telescope at
Cassegrain focus |
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