发明名称 |
Wide angle lens attachment |
摘要 |
A wide angle attachment adapted to be used with a prime lens. The lens comprises four elements in three groups. The combination of the attachment with a prime lens results in a lens system having a larger field of view than the field of view of the prime lens by itself.
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申请公布号 |
US4367928(A) |
申请公布日期 |
1983.01.11 |
申请号 |
US19800139346 |
申请日期 |
1980.04.11 |
申请人 |
VIVITAR CORPORATION |
发明人 |
KREITZER, MELVYN H.;CHEN, MUH-FA |
分类号 |
G02B13/22;(IPC1-7):G02B13/22 |
主分类号 |
G02B13/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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