Judging from recent patent applications from Canon, we might see two new zoom lenses for the EOS R system: a 17-70mm and a 52-83mm f/1.2 lens. They both include multiple optical formulas, which could mean that we’ll see them in production in the future.
Canon 17-70mm f/3.5-5.6
According to the patent, the 17-70mm lens will come with the aperture range between f/3.5 and f/5.6. There are three optical formulas discussed in the patent for this lens:
Focal length 17.40 35.02 68.69F-number 3.57 4.18 5.85Half field angle (degrees) 51.19 31.71 17.48Image height 21.64 21.64 21.64Total lens length 149.59 133.68 150.50BF 13.43 27.63 57.99
Focal length 17.10 34.82 72.70F number 3.57 4.18 5.85Half angle of view (degree) 51.68 31.85 16.57Image height 21.64 21.64 21.64Total lens length 151.00 135.57 157.71BF 13.13 27.81 63.49
Focal length 18.70 37.55 77.50F-number 3.57 4.18 5.85Half angle of view (degree) 49.16 29.95 15.60Image height 21.64 21.64 21.64Total lens length 146.50 128.90 147.50BF 15.19 27.72 59.84
Canon 52-83mm f/1.2
Another lens has a pretty weird zoom range of 52-83mm. However, it will probably be marked as 50-80mm (and it’s still pretty unusual). For this lens, there are two optical formulas in the patent:
Zoom ratio: 1.60Focal length: 51.50 – 64.01 – 82.52 mm: 1.24Half angle: 22.79 – 18.67 – 14.69Lens length: 201.66 – 204.48 – 204.68 mmBack focus: 22.89 – 23.95 – 25.47 mm
Zoom ratio: 1.60Focal length: 51.50 – 64.01 – 82.52 mm: 1.13Half angle: 22.79 – 18.67 – 14.69Lens length: 220.20 – 225.05 – 224.20 mmBack focus: 6.51 – 6.53 – 8.64 mm
Since the lenses are still just patents, we don’t know when and if they will go in production. Since the EOS R system is still relatively new, there aren’t too many lenses available for it yet. You can get the “holy trinity” of zoom lenses and a few primes from Canon. All the other lenses are coming from third-party manufacturers such as Lensbaby, Venus Optics, Mitakon or Meike. So, I believe Canon will certainly launch a few more models. Whether those will be the 17-70mm and a 52-83mm, I guess we have to wait and see. [via Canon Watch (Canon 17-70mm f/3.5-5.6 | Canon 52-83mm f/1.2)]
