Camera lens attachment to aid focusing
US5416544A · kind A · utility
33Cited by
1References
4Claims
0Family size
Inventor
Key dates
| Filing date | Dec 7, 1993 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Dec 7, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An attachment for the lens of a camera to facilitate macro photography. The device comprises a clear plastic tube, manufactured to the precise length required to achieve 1:1, or other desired close-up ratio, focusing for a given camera. The plastic tube is provided with a step-up ring at one end to provide a means for threaded attachment to the camera lens. The device is then screwed onto the lens of a camera to take close range photos.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.