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    Patent: Some crazy fast RF mount prime lenses, including an RF 18mm f/1.0L

    By Updated:84 Comments1 Min Read Canon Patents
    patentrffastprime 728x462 - Patent: Some crazy fast RF mount prime lenses, including an RF 18mm f/1.0L

    Back in August, I mentioned that Canon was working on a whole line of f/1.2L prime lenses for the RF mount. So far we have the RF 50mm f/1.2L USM and the RF 85 f/1.2L USM, but there are more clues that more f/1.2L lenses are in the pipeline.

    Canon News has uncovered the following optical designs for the RF mount.

    Canon RF 18mm f/1.2L USM

    • Focal length 18.51mm
    • F-number 1.24
    • half angle of view (degree) 49.45°
    • Image height 21.64mm
    • Total lens length 129.00mm
    • BF 16.40mm

    Canon RF 24mm f/1.2L USM

    • focal length 24.59mm
    • F-number 1.24
    • half angle (in degrees) 41.35°
    • Image height 21.64mm
    • Total lens length 129.01mm
    • BF 13.57mm

    Canon RF 16mm f/1.4L USM

    • Focal length 16.42mm
    • F-number 1.43
    • Half angle of view (degree) 52.80°
    • Image height 21.64mm
    • Lens total length 133.46mm
    • BF 13.55mm

    Also included in this latest patent, is a crazy fast wide angle prime lens design.

    Canon RF 18mm f/1.0L USM

    • Focal length 18.50mm
    • F-number 1.03
    • Half angle of view (degrees) 49.47°
    • Image height 21.64mm
    • Lens total length 150.00mm
    • BF 4.99mm
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    84 comments

    1. To be fair, as we mentioned, it's unlikely that 18mm gets made - it has a 5mm back focus distance which is pretty tight for the RF mount.

      but just the fact that they came up with a design for an 18mm F1.0 is pretty incredible.
    2. I wonder if the more recent explosion in popularity for ultra-wide angle lenses on smartphones is encouraging them to look into these design options. Smartphone photography, being so ubiquitous, could easily be shaping trends.
    6. I wonder if the more recent explosion in popularity for ultra-wide angle lenses on smartphones is encouraging them to look into these design options.
      Smartphones don't even begin to compare with the light gathering ability of these lenses on an FF mount. If offering an alternative to a smartphone would be the goal here, I imagine these lenses would be f4 and focused on small size, instead of being so bright.

      Seems to me like Canon wants to have camera system with truly leading low light performance. People mention all the time that they want an improvement in this regard, even though they sensor technology is basically as good as it will get in this regard. Faster glass, however, yields actual improvements.
    8. I know most will likely never see the light of day, but oh man, an 18mm f/1 would be potentially a heck of an astrophotography lens.

      If the RF mount enables these sort of speed demons, I'm all for it!
    12. To be fair, as we mentioned, it's unlikely that 18mm gets made - it has a 5mm back focus distance which is pretty tight for the RF mount.

      Why is a small BF tight? what is the BF measurement?
    13. Hah, it'd be interesting to see how much a 100mm or even a 135 mm f/1.2 would end up going for. (And how much that heavy beast would bend light OUTSIDE of the optical pathway from its gravity.)
    14. Why is a small BF tight? what is the BF measurement?
      The distance between the sensor and the last lens element, if I'm not mistaken. With the RF flange distance being 20mm, this means the lens sticks out beyond the mount quite a bit, which might mean this is not a practical design.
    16. And this is like "5 kg" lens. Old farts will never go to gym, in order to handle those lens. So we will no see those lens.
      Apart from going into uncalled for assumptions with your commen, your argument is flawed.

      For one, these lenses are very wide so they don't need to be as big and heavy as the already existing 1.2 RF primes. And as I said, there already are big and heavy primes in the RF lineup, showing that Canon does not hesitate to release such lenses if they provide sufficient quality to make up for it.
    17. Pretty amazing stuff being explored.
      Would be great if they can make some with a price that is somewhat affordable.
      The RFs are extremely expensive I will continue to use EFs until maybe RFs go down in price or get refurbs.
    18. Wow! sure makes one wish he had a wheel barrow full of money.
      And just how is an old fart going to roll that wheelbarrow to the bank? You have to get a strapping mirrorless millennial to roll it there for you. Then we can roll your wheelchair to the tripod where the 5kg lens is mounted. All set!

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