| 发明名称 |
Optical accessory for photographic apparatus |
| 摘要 |
The present invention is directed to an optical accessory for use with photographic apparatus. The accessory is releaseably coupled to the lens system and can releaseably support a plurality of optical elements in relation to the lens system.
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| 申请公布号 |
US4639109(A) |
申请公布日期 |
1987.01.27 |
| 申请号 |
US19850740852 |
申请日期 |
1985.06.03 |
| 申请人 |
POLAROID CORPORATION |
发明人 |
HUDSPETH, WILLIAM |
| 分类号 |
G03B11/00;(IPC1-7):G03B11/00;G02B7/00 |
主分类号 |
G03B11/00 |
| 代理机构 |
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