Here is a Canon patent application (2019-020679) for a RF 70-300mm F/4-5.6 IS 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.
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 70-300mm f/4-5.6 IS Lens. Check it out!
Patent : Canon RF 70-300mm f/4-5.6 IS Lens
- Zoom ratio: 4.11
- Focal length: 71.40~136.34~293.23 mm
- F number: 3.94~4.72~5.83
- Half angle of view: 16.86~9.02~4.22
- Image height: 21.64 mm
- Lens length: 165.00~202.03~235.83 mm
- Back focus: 12.14~31.67~72.45 mm
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