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    Patent: Lots of optical formula lens patents for the RF mount

    By Updated:46 Comments2 Mins Read Canon Patents
    rf1535png 728x462 - Patent: Lots of optical formula lens patents for the RF mount

    Canon is full steam ahead as far as lens development goes, as a whole slew of optical formulas have appeared at patent offices.

    First up, the RF mount.

    Japan Patent Application 2019-066701

    Canon RF 15-35mm f/2.8L

    • Focal distance 15.30mm 24.20mm 34.00mm
    • F number 2.91 2.91 2.91
    • Field angle 54.73° 41.80° 32.47°
    • Image height 21.64mm 21.64mm 21.64mm
    • Whole length of the lens 135.05mm 125.84mm 125.33mm
    • BF 13.00mm 22.20mm 32.26mm

    Canon RF 17-70mm f/3.5-5.6

    • Focal distance 17.3mm 35.00mm 68.00mm
    • F number 3.58 4.18 5.85
    • Field angle 51.35° 31.72° 17.65°
    • Image height 21.64mm 21.6mm4 21.64mm
    • Whole length of the lens 142.70mm 138.53mm 143.42mm
    • BF 13.32mm 29.60mm 57.62mm

    Japan Patent Application 2019-066654

    Canon RF 15-35mm f/4L

    • Focal distance 15.45mm 24.00mm 34.00mm
    • F number 4.12 4.12 4.12
    • Half field angle 54.47° 42.03° 32.47°
    • Image height 21.64mm 21.64mm 21.64mm
    • Whole length of the lens 125.38mm 119.21mm 116.89mm
    • BF 12.00mm 19.66mm 24.40mm

    Canon RF 16-35 f/4L

    • Focal distance 16.48mm 24.00mm 34.00mm
    • F number 4.12 4.12 4.12
    • Half field angle 52.70° 42.03° 32.47°
    • Image height 21.64mm 21.64mm 21.64mm
    • Whole length of the lens 127.27mm 116.39mm 111.30mm
    • BF 10.95mm 16.82mm 23.58mm

    Japan Patent Application 2019-066653

    Canon RF 14-40mm f/4L

    • Focal distance 14.43mm 21.62mm 40.74mm
    • F number 4.12 4.12 4.12
    • Half field angle 56.30° 45.01° 27.97°
    • Image height 21.64mm 21.64mm 21.64mm
    • Whole length of the lens 138.31mm 128.15mm 129.29mm
    • BF 12.84mm 12.84mm 12.84mm

    Canon RF 16-40mm f/4L

    • Focal distance 16.41mm 23.12mm 38.80mm
    • F number 4.12 4.12 4.12
    • Half field angle 52.82° 43.10° 29.14°
    • Image height 21.64mm 21.64mm 21.64mm
    • Whole length of the lens 118.88mm 112.53mm 114.89mm
    • BF 12.78mm 12.78mm 12.78mm
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    46 comments

    1. SHUT UP AND TAKE MY MONEY!

      Right?

      I was stoked when I discovered the F4.0 UWA patent embodiments.

      Check out some of the EF primes though we discovered on our site. There's some eye watering amazing primes we found today too. I assume CR is going to re-post those as well.
    8. Canon RF 17-70mm f/3.5-5.6
      Is a APS-C lens?
      As far as I know the Image Height is the same as image radius and this is roughly 21.5mm = FF compatible.

      For me an ingenious ultrawide-to-small-tele range which fits well to a 70-200 option or - if you do not mind the gap - a 100-400 option - therefore it is well suited for a two-lens-two-body solution.
    10. SHUT UP AND TAKE MY MONEY!
      Ha, I thought the same! Thats an incredible usefull focal lense! For weddings and travel this would be the shit! I love the Tamron 15-30, especialy for travel. But I always miss a little bit more focal lenght for some "normal" portraits or something. 14-40 sounds awesome. f2,8 would be even more awesome, but I guess that would have increased the weight and size to much. =)
    11. As far as I know the Image Height is the same as image radius and this is roughly 21.5mm = FF compatible.

      For me an ingenious ultrawide-to-small-tele range which fits well to a 70-200 option or - if you do not mind the gap - a 100-400 option - therefore it is well suited for a two-lens-two-body solution.

      Interesting. Canon 5D IV sensor height is 24mm.
      Canon 700 FF has a 38.1mm x 20.1mm sensor

      Therefore, the lens, seems, is suitable for Canon 700 perfectly. Or... takes care of the x1.7 video crop factor of the new R/RP. ;)
      It becomes 29-120 when R/RP in video mode
    12. Interesting. Canon 5D IV sensor height is 24mm.
      Canon 700 FF has a 38.1mm x 20.1mm sensor

      Therefore, the lens, seems, is suitable for Canon 700 perfectly. Or... takes care of the x1.7 video crop factor of the new R/RP. ;)
      No, the image height specification is actually the radius the image circle, or 1/2 the diagonal measurement.
      21.64 is the standard measurement for a full frame sensor in Canon patent applications.
    16. 17-70mm f/3.5-5.6 is also a nice lens paired with the RP.
      I agree, if I am going for the RP (still making my mind up) I'd really prefer such a smaller, more compact and light zoom as a starter. When I want a big & fast lens, I always can adapt my EF 50mm and 85mm f/1.2 lenses - or the lighter EF 50mm f/1.4.
    18. So are these aimed APS-c bodies with the small image height e.g. RF-s

      No, as has been said above, ”image height” means image circle radius ie. half frame diagonal. Which is 21.6mm for FF.
    19. What should I get? RF15-35 2.8L IS or wait even longer for RF14-40 4L? >_<
      Depends on how much you are in a hurry. Personally, I'd prefer less fast (ultra) wide angle lenses since in most cases you need to go for higher f-stop numbers anyway to get a sufficient depth of field (landscapes, cityscapes). So, mostly you carry extra weight, need extra space and pay extra money for nothing useful. Big, fast lenses make more sense IMO in the 50 mm and upward focal distance range, e.g. for portrait. That's why I always preferred my Zeiss Distagon 18mm f/3.5 over the higher regarded Zeiss 21mm f/2.8, since the 18mm is relatively light and compact. And I nearly never shoot that one completely wide open.

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