Importance

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Abstract

A high-aperture wide angle lens consisting of a divergent action group on the lens side, an air space corresponding to 0.3 to 0.7 times or 0.25 times to 0.45 times the total overall height of the wide angle lens, an aperture diaphragm located approximately in the center, followed by a positive lens group consisting of a cemented element with total positive refractive power and a second convergent action group whereby the divergent action group on the lens side, and the second divergent action group each possess at least one aspherical surface. In such a four-lens or six-lens structural design, a typical image field angle of 130.vertline. or 146.vertline. or more is achieved at an f-stop of approximately 2.0. The high-aperture wide angle lens is particularly suited as a photographic field lens for electronic image processing systems such as CCD cameras.

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First Claim