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| Canon EF 180mm f/3.5 DO Macro Lens? |
Egami, the Japanese photography blog has uncovered a Canon patent for the EF 180mm f/3.5 DO Macro lens. Frankly, I am puzzled by this design. The current EF 180mm f/3.5L is a slow lens but it's not heavy. If I were Canon, I'd make the lens faster and add IS instead of making it smaller and lighter. But then it's only a patent. Many patents never make it to the market anyway.
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 ? = 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
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