CHARACTERISTICS OF THE ADC's | |||||
|
|||||
To achieve this, the dispersive elements of our ADC are designed as plan plates. Each plate consists of two complementary prism of different glass sorts glued together. The glasses have the same refraction index but different dispersion (Abbé number). Simple correctors using 2 single prism which have to be turned contra directionally to achieve the appropriate correction have following disadvantages: - The single prism system will shift considerable the image during the adjustment process for eliminating the atmospheric dispersion - Further on the single prism system introduces an asymmetry into the optical system which results in a reduced optical performance. For this setup the diffraction limited performance of the telescope may no longer given.
|
|||||