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.