Here is a Canon patent application for a RF 70-400mm f/4.5-5.6L IS USM Lens. Designed for Canon full frame mirrorless camera system, this lens is the EOS R version of the budget-friendly telephoto zoom for the consumer market.
According to latest rumors, this super telephoto zoom lens is expected to be announced in the first half of 2020.
EOS R is the first camera to feature the RF lens mount with a 12-pin connection, flange back distance of 20mm and a wide 54mm mount diameter enabling even greater flexibility in lens design. The EOS RP is also coming.
The first four Canon RF lenses are the RF 24-105mm f/4L USM, RF 28-70mm f/2L USM, RF 35mm f/1.8 M IS, RF 50mm f/1.2L USM. All four lenses have customizable control rings.
In this patent, Canon shows an optical formula for a RF 70-400mm f/4.5-5.6L IS USM Lens. Check it out!
Canon RF 70-400mm f/4.5-5.6L IS USM:
- Focal length: 72.62mm 168.49mm 389.89mm
- F number: 4.07 5.10 5.85
- Half angle of view: 16.59° 7.32° 3.18°
- Image height: 21.64mm 21.64mm 21.64mm
- Total lens length: 187.91mm 236.14mm 268.26mm
- BF: 13.80mm 27.53mm 35.04mm