Canon filed a patent for a 50mm f/1.4 lens. The patent literature refers to AF speed improvements.
The current EF 50mm f/1.4 was released back in 1993. A replacement could be on its way. It’s likely we have the patent for Canon’s next EF 50mm f/1.4 lens.
- Patent Publication No. 2015-138121
- Published 2015.7.30
- Filing date 2014.1.22
- Example 1
- Focal length 49.10
- F number 1.45
- Half angle (in degrees) 23.78
- Image height 21.64
- Overall length of the lens 100.16
- BF 38.10
- Canon patents
- Positive ShiboTadashi
- Inner focus (part of the first group)