Photographic lens optical system
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United States of America Patent
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Dec 12, 2017
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app pub date -
Jul 15, 2016
filing date -
Dec 23, 2015
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Abstract
A photographic lens optical system includes first to fifth lenses sequentially arranged in a direction away from an object. The first lens may have a negative refractive power, the second lens may have a positive or negative refractive power, the third lens may have a positive refractive power, the fifth lens may have a negative refractive power, and the fifth lens may have a positive refractive power. The first and fifth lenses may be spherical lenses. The fifth lens may be a biconvex lens. The second to fourth lenses may be aspherical lenses. An aperture stop may be between the second and third lenses. The photographic lens optical system may satisfy the inequality −2.3
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