Sigma patent a 25 mm F1.4 micro four third lens, the patent is spotted by patent hunting blog Egami.
Patent Details
- Patent Publication No. 2013-3324
- 2013.1.7 Release Date
- Filing date 2011.6.16
- Example 2
- Focal length f = 25.00mm
- Fno. 1.44
- 2ω = 48.61 ° angle of view
- Nine lens elements in 7 groups configuration
- Two three-sided aspherical
- (More than n = 2.00) one high refractive index glass
- Four groups of positive and negative positive negative
- Inner Focus (group 3)
