Canon 180mm F3.5 Macro DO patent surfaced over the web today, the patent publication was registered at 2013.1.17, take a look at the details below
Explanation and self-interpretation of the patent literature
- Patent Publication No. 2014-137484
- Published Date 2014.7.28
- Filing date 2013.1.17
- Example 1
- Focal length f = 180.00mm
- Shooting magnification ∞ 0.5x 1.0x
- Fno. 3.50-4.50-5.20
- Half angle ω = 6.85 °
- Image height 21.64mm
- The overall length of the lens 202.38mm
- BF 52.18mm
- Effective diameter of the front lens 58.18mm
- 12 sheets 8 groups lens configuration
see more DO lens patent from Canon – Canon Patents 70-300mm, 100-400 mm F4.5-5.6 DO Lens and see all Canon Patents
