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    Patent: Canon RF mount Big White Lenses

    By Updated:60 Comments1 Min Read Canon Patents
    patentrfbigwhites - Patent: Canon RF mount Big White Lenses

    Big white lenses for the RF mount are a logical next step for Canon, and I was expecting to see at least a couple of them announced ahead of the Tokyo games this year, but that appears to still be in a certain level of flux, so who knows at this point?

    Outside of an RF 300mm f/2.8L IS USM, all of the optical formulas that appear in this USPTO patent uncovered by Northlight Images are also part of the rumoured RF lens roadmap that I published a while ago.

    Another of the rumoured lenses on our roadmap is an RF 1200mm f/8L IS USM, but I haven't seen any sort of patent reference for such an optical formula yet.

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    2. Interesting that they all are listed as longer than the EF mount versions?

      I'm guessing that the design for telephoto lenses stays pretty similar except that they basically have a built in RF adapter to bridge the extra backfocus, but I'm sure there's not much Canon can do about that in those designs
    4. Interesting that they all are listed as longer than the EF mount versions?
      Keep in mind that you have to subtract the 20 mm flange distance from the total lens lenght figure in the patents, and also add 24 mm to the length of any EF lens to account for the adapter.
    8. No DO design plus the latest big whites have superb IQ. I will pass. Automatically I will be saving huge amount of money.
      Of course if someone starts from scratch that is a different story.
    9. Hoping for a 600 mm RF big white that will drive down the cost of the EF 600mm III.

      I would be very interested to know if Canon will make a whole new lens for the 600mm on the RF mount, or will adapt the EF design for RF uses in some way.

      I assume Canon has been eyeing making the big whites DO like in their sample DO 600mm F/4, which looked amazing, but it seems like that has taken awhile.

      Another interesting thought--I know the F/11 lenses are consumer based, but what if Canon make the 500mm F/4, for example, collapsible as well? I see no reason they couldn't make a super sturdy geared mechanism for that.
    10. My wishes to new white L primes:
      Reducing the price... and the minimum focus distance!! more in the direction of zoom lenses please... not over 3m! <3m would be fine to me!

      To have a solid line-up Canon needs a great combination of bright (2.8/4.0) and more mobile/flexible lenses (4.0/5.6 & ZOOOMS!)
    11. My wishes to new white L primes:
      Reducing the price... and the minimum focus distance!! more in the direction of zoom lenses please... not over 3m! <3m would be fine to me!

      To have a solid line-up Canon needs a great combination of bright (2.8/4.0) and more mobile/flexible lenses (4.0/5.6 & ZOOOMS!)
      And the size ... and the weight ... and then I wake up :ROFLMAO:

      EDIT: But some of these can be achieved by ... cheating on f/sise: Let's say a 600 f/5.6 DO or a 800 f/8 or ...
    12. With the new RF teleconverters these are going perform even better than before.
      I would not be so sure. Canon's MTF charts certainly don't show that comparing the effects of the 1.4xTCIII on the 100-400mm II with the RF 1.4x on the 100-500mm. Also, the new designs for the big whites have Canon's new method of reducing weight by replacing the heavy big elements at the front behind the front element with smaller ones further back. This slightly lowers the IQ of the 600mm f/4 L according to TDP https://www.the-digital-picture.com...LensComp=748&CameraComp=0&FLIComp=0&APIComp=0 and Canon's MTF chart for the old 400mm f/2.8 II (right) is better than for the version III (left).

      mtf_400_III.pngmtf_400_II.png
    13. Another interesting thought--I know the F/11 lenses are consumer based, but what if Canon make the 500mm F/4, for example, collapsible as well? I see no reason they couldn't make a super sturdy geared mechanism for that.
      Or a module system, like Leica's APO-Telyt-Modules for their R system once ;):

      www.apotelyt.com

      Leica APO-Telyt-R Module 280 / 400 / 560 / 800 mm

      Information resources for users of Leica's Apo-Telyt-R Module system. Learn more about these exceptional tele-photo lenses!
      www.apotelyt.com www.apotelyt.com
    16. I had a hope Canon will do a mount conversion service on the EF 600mm f/4L IS USM III and EF 400mm f/2.8L IS III, but if they are going to introduce new lens probably they are not going to do mount conversion on the EF version
    18. I'd like some pricing so I can figure if I need to sell both my kidneys!

      That's not the question, you will.

      Will you have to abduct someone off the street (or cannibalize a relative) to sell their kidneys as well? That's the real question.
    19. Would be a great opportunity (although expensive) to move forward to a 400 2.8. The current EF III is amazingly light. Currently shooting a 500 f/4 so I’d have to sell that to make it financially bearable, but 400 2.8 would fit my needs better

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