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The spot size measurement





The CCD camera placed at the mirror centre.

The Tyvek screen placed on the focal surface, as seen from the CCD camera.

CCD camera pictures of the spot. Stars are imaged on the Tyvek screen. Figures 1 to 3 show correspond to measurements performed with the 1.7 m diaphragm (no corrector ring). Figures 4 to 6 correspond to measurements performed with the corrector ring. The design spot size diameter of 15 mm is achieved.






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