3. Optics



3.1 Primary Focus



With the Cassegrain optic the primary reflector focus is usable only if the secondary reflector is completely retracted. Behind the mirror a movable positioner is installed, equipped with 3 receiver bays.




Fig. 3.2 : Primary focus feed positioner


The primary mirrror focal length is nearly 10.3 m,  therefore the focal ratio is F1/D 0.32.



Fig. 3.3 : Primary focus (dimensions : mm)


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