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Considerations on the interferometric testing of convex hyperboloidal surfaces

Two methods for hyperbolic secondary telescope mirror testing have been proposed for interferometrical testing. In the traditional one, a compensator is used to correct for the most significative aberrations. Other method calls for the use of an appropriate capture and analysis software, and the need for a compensator is eliminated. On a computation based system, some other restrictions appear. Both analysis methods are reviewed and compared.