Canon latest patent reveals 58mm Lens with bright F1.4 aperture for professional use, Birth of new 58mm category – Nokoton was the first to announce 58mm lens [Amazon] and the announcement was followed-up by Nikkor 58mm F1.4 [Amazon] and finally Canon also jumped on the same boat to compete with the N 2 , the detail of the patent is below.
Description, self-interpretation of the patent literature
- Patent Publication No. 2015-172611
- Published 2015.10.1
- Filing date 2014.3.11
- Example 1
- Focal length 57.99
- F-number 1.45
- Half angle (in degrees) 20.46
- Image height 21.64
- Overall length of the lens 117.64
- BF 38.23
source – egami
