Canon has just filed a new patent for EF 16-40mm F/4 USM lens. This new lens may replace the current Canon EF 17-40mm f/4L USM.
Detail translated by Google:
- Patent Publication No. 2015-206976
- Published 2015.11.19
- Filing date 2014.4.23
- Example
- Zoom ratio 2.36
- Focal length 16.48 24.40 38.90
- F-number 4.12 4.12 4.12
- Half angle (in degrees) 52.70 41.56 29.08
- Image height 21.64
- Overall length of the lens 177.74 162.40 159.73
- BF 38.00 45.51 63.40
Source: EG
Read More Canon Lens Patent