| 发明名称 |
Retrofocus type wide angle photographic lens |
| 摘要 |
A retrofocus type wide angle photographic lens is disclosed comprising eight lens elements grouped into eight lens components. The lens has an aperture ratio 1:2.5 and a viewing angle of 85 DEG .
|
| 申请公布号 |
US4217034(A) |
申请公布日期 |
1980.08.12 |
| 申请号 |
US19790002135 |
申请日期 |
1979.01.09 |
| 申请人 |
ASAHI KOGAKU KOGYO K K |
发明人 |
SUGIYAMA, TAKAHIRO |
| 分类号 |
G02B13/04;(IPC1-7):G02B13/04 |
主分类号 |
G02B13/04 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
