Northlight has uncovered a USPTO patent for various fast prime optical formulas, included in the patent is the design for an RF 135mm f/1.8L. A lens we definitely think will be released sometime in 2020.
Canon RF 135mm f/1.8L USM embodiment:
- Focal length: 133.0mm
- F number: 1.80
- Half angle of view: 9.2°
- Image height: 21.6mm
- Overall length of lens: 150mm
- Backfocus: 18mm
This patent also includes designs for an RF 85mm f/1.2L USM (which is already announced) along with an RF 100mm f/1.4 fast prime. We think the 135mm f/1.8 is more likely to come than a RF 100mm f/1.4.