Importance

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Abstract

A photographic objective lens (100), comprising a first lens (110), a second lens (120), a third lens (130), a fourth lens (140), a fifth lens (150), a sixth lens (160) and a seventh lens (170) sequentially arranged along a transmission direction of incident light. The first lens (110) is a meniscus negative lens and comprises a first curved surface (111) and a second curved surface (112); the second lens (120) is a positive lens and comprises a third curved surface (121) and a fourth curved surface (122); the third lens (130) is a meniscus negative lens and comprises a fifth curved surface (131) and a sixth curved surface (132); the fourth lens (140) is a positive lens and comprises a seventh curved surface (141) and an eighth curved surface (142); the fifth lens (150) is a double-concave negative lens and comprises a ninth curved surface (151) and a tenth curved surface (152); the sixth lens (160) is a meniscus positive lens and comprises an eleventh curved surface (161) and a twelfth curved surface (162); and the seventh lens (170) is a double-concave positive lens and comprises a thirteenth curved surface (171) and a fourteenth curved surface (172). The photographic objective lens (100) mentioned above can be directly used for underwater photography, has no need of a sealing box and is simple in terms of view finding and large in view finder coverage, and an underwater field-of-view angle thereof reaches 62 degrees.

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First Claim