A patent for an optical formula showing a wide angle zoom lens for a full frame mirrorless body has appeared.
It looks like this patent is for a 16-30mm f/2.8 and has a short backfocus of 11.34mm, which tells us it’s not for a DSLR.
Canon 16-30mm f/2.8 Specifications: (Japan Patent Application 2018-077320)
- Zoom ratio: 1.67
- Focal length: 16.48-27.44mm
- F number: 2.88
- Half angle: 52.70 – 38.25
- Image height: 21.64mm
- Back focus: 12.33 – 10.00mm