The numerous lenses of the objective have considerable, anomalous partial dispersion. Behind the system shutter (24) are several collector lenses (25,29,35,37) of Langkron type, while the dispersion lenses (27,31) are of Kurzflint type. The objective front lens (1) is a collector of the Langkron type. In the main group (103) behind the shutter the lenses are of the above mentioned type. In front of the shutter is a group containing several lenses of positive refraction, Langkron type (1,11,15). Several lenses of negative refraction, Kurzflint type (3,7,9), while in a middle group (102) are lenses of reverse type (17,22).
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