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    Patent: Canon continues to develop fast RF prime lens optical formulas

    By Updated:32 Comments1 Min Read Canon Patents
    canonrf5012lpng 728x462 - Patent: Canon continues to develop fast RF prime lens optical formulas

    Canon continues to patent optical formulas for fast RF mount prime lenses. This patent deals with limiting aberration fluctuation when focusing.

    Canon is currently missing RF L prime lenses wider than 50mm (I'm not counting the RF 5.2mm f/2.8 Dual Lens Fisheye), and I expect that to change relatively soon.

    Canon RF 18mm f/1.8

    • Focal length: 18.54mm
    • F-number: 1.85
    • Half angle of view (°): 49.41°
    • Image height: 21.64mm
    • Lens total length: 107.66mm
    • BF: 14.09mm

    Canon RF 24mm f/1.8

    • Focal length: 23.83mm
    • F-number: 1.85
    • Half angle of view (°): 42.24°
    • Image height: 21.64mm
    • Lens total length: 104.66mm
    • BF: 15.90mm

    Canon RF 20mm f/1.8

    • Focal length: 20.48mm
    • F-number: 1.44
    • Half angle of view (°): 46.56°
    • Image height: 21.64mm
    • Lens total length: 124.66mm
    • BF: 13.16mm

    Canon RF 28mm f/1.8

    • Focal length: 28.08mm
    • F-number: 1.85
    • Half angle of view (°): 37.61°
    • Image height: 21.64mm
    • Lens total length: 92.66mm
    • BF: 12.16mm
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    32 comments

    2. OK, I developing a lens too:

      Focal length: 84.3 mm
      F-number: 0.71
      Half angle of view (°): 14.32°
      Image height: 24.54mm
      Lens total length: 132.66mm
      BF: 15.41mm

      This will be an autofocus lens with hyper drive liquid focusing elements, and with 8 stop image stabilization. ;)
    4. OK, I developing a lens too:

      Focal length: 84.3 mm
      F-number: 0.71
      Half angle of view (°): 14.32°
      Image height: 24.54mm
      Lens total length: 132.66mm
      BF: 15.41mm

      This will be an autofocus lens with hyper drive liquid focusing elements, and with 8 stop image stabilization. ;)
      Harry??
    7. I'm just waiting for the price of the 100-500mm to drop to a more affordable level and become more easily available. I've already got the 24-105mm F4L, the 600mm F11 and 800mm F11. Most of the other existing RF lenses and those on the roadmap have limited appeal to me - the 100mm macro for example is optically no better than my existing 11 year old EF 100mm macro, and the "aspherical aberration control" is just an unwanted extra for macro work.

      It would I suppose be nice to have AF in a tilt-shift, but I can happily live with the manual focus of my 24mm TS-E. A lens that would be really useful to me would be a compact stabilised AF 180mm F5.6 macro, but I'll be banging my head against a brick wall forever more waiting for that to happen. Ends of minor rant, relax, take a pill.
    9. OK, I developing a lens too:

      Focal length: 84.3 mm
      F-number: 0.71
      Half angle of view (°): 14.32°
      Image height: 24.54mm
      Lens total length: 132.66mm
      BF: 15.41mm

      This will be an autofocus lens with hyper drive liquid focusing elements, and with 8 stop image stabilization. ;)
      I thought I was reading a post from Harryfilm for a second there...
    13. I thought 1.2 or 1.4 was considered 'fast' for prime lenses.
      Nikon and leica made the names on f2 glass for decades, and that was a period when 400 tri-x was "fast film" :LOL: A 1.8 or 2 is just perfect for me! Bring them on!
    14. Nikon and leica made the names on f2 glass for decades, and that was a period when 400 tri-x was "fast film" :LOL: A 1.8 or 2 is just perfect for me! Bring them on!
      Sure. But...
    15. CRGuy's lens roadmap lists a 24mm f1.8 STM macro, not sure if this is the same lens, but I'd be surprised if Canon released both an "L" and non "L" version in the same aperture/focal length.

      If I had to guess, I would be surprised if we will see all these lenses, especially in the near term. Hard to imagine both an 18mm and a 20mm. Eighteen, 24 and 28 make the most sense to me, although I'm not sure how popular 28mm lenses are today.
    16. OK, I developing a lens too:

      Focal length: 84.3 mm
      F-number: 0.71
      Half angle of view (°): 14.32°
      Image height: 24.54mm
      Lens total length: 132.66mm
      BF: 15.41mm

      This will be an autofocus lens with hyper drive liquid focusing elements, and with 8 stop image stabilization. ;)
      Two please.
    18. In dark environments video AF isn't as reliable as one would want, the C70 with the RF 15-35mm fails me too often.
      3D-AF on the Ronin RS2 solves this problem, but unfortunately only on manual focus lenses without any calibration drift. I'd love lenses that can engage hard stops on both ends for external focus drives, if required.

      Looking at the LIDAR 4D-AF of the coming Ronin 4D, this will soon prove helpful.

      The alternative of course would be to build a LIDAR add-on for Canon cameras as well. That would work with internal focus drives, then.

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