Photographic optical system
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United States of America Patent
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May 29, 2018
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N/A
app pub date -
Nov 17, 2016
filing date -
Dec 24, 2015
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Abstract
The present invention discloses a photographic optical system which includes a first lens (focal length f1), a second lens (focal length f2), a third lens (focal length f3), a fourth lens (focal length f4), a fifth lens (focal length f5), a sixth lens (focal length f6) and a seventh lens (focal length f7). The photographic optical system disclosed in the present invention by optimizing rationally face shape, distributing refractive power, selecting optical material, is designed as a big relative stop photographic optical system, and can provide the imaging performance in low illumination environment.
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