A TWO-COMPONENT APOCHROMATIC OBJECTIVE,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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This Author Certificate presents a two-component apochromatic objective with lenses made of two types of glass. One type is the heavy crown glass TK4, the other is Kurts-flint glass OF4. To keep the spherical aberration to its minimum value, the objective components are made up by cementing two lenses. The first and the fourth of these are made of crown glass, the second and the third of flint glass, and the optical power of the first component is equal to 0.4-0.6 of the power of the entire objective.