3. Surface finishes
We successively study the effects of typical local defects and roughness on the image of a point, the image of a low-contrast test pattern, and then the image of a test pattern when a bright source, such as the sun, illuminates the pupil.
Although highly efficient, optical polishing never produces absolutely perfect surfaces. There are always a few local defects, due to the raw material, impacts, surfacing operations, as well as micro-roundness called roughness.
The study is limited to the case of defects located in the plane of the pupil of the instrument, assumed to be stigmatic.
3.1 Local faults
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Surface finishes
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