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Author Topic: Patent: Canon 11-24mm f/4 Lens  (Read 10027 times)

JVLphoto

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Patent: Canon 11-24mm f/4 Lens
« on: January 25, 2014, 08:46:42 AM »

Egami has shown that Canon has filed a patent for an ultra-wide angle zoom:


(Translated)


Description and self-interpretation of the patent literature


Patent Publication No. 2014-10286


  • Publication date 2014.1.20

  • Filing date 2012.6.29



  • Example 1


  • Zoom ratio 2.06

  • Focal length f = 11.30-18.00-23.30mm

  • Fno. 4.10

  • Half angle ω = 62.42-50.24-42.88mm

  • Image height Y = 21.64mm

  • 172.19-161.28-162.86mm overall length of the lens

  • BF 38.82-52.31-63.15mm



  • Canon users have been left out in this focal range for quite some time. With Nikon and their legendary 14-24mm f/2.8G ED and  other third party offerings filling up the gap in the market. Can Canon produce an optically superior lens that also has such a shallow depth of field? Until they do, the only wide-angle zooms that Canon makes that come close are the 16-35 f/2.8 L II or the 8-15mm f/4L Fisheye.


    [Egami]


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    Patent: Canon 11-24mm f/4 Lens
    « on: January 25, 2014, 08:46:42 AM »

    friedrice1212

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #1 on: January 25, 2014, 09:09:33 AM »
    "Image height Y = 21.64mm"

    This is for APS-C sensors, no? Replacement for EF-S 11-22mm 4-5.6 maybe?

    mkabi

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #2 on: January 25, 2014, 09:47:33 AM »
    "Image height Y = 21.64mm"

    This is for APS-C sensors, no? Replacement for EF-S 11-22mm 4-5.6 maybe?

    How did you figure that?
    The patents for the 85, 100 & 135 all had "Image height Y = 21.635mm"

    You're saying that 0.005mm difference is all that is needed between a EF & EF-S lens?
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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #3 on: January 25, 2014, 09:48:44 AM »
    "image height" would give the radius of the image circle. Double that is enough to cover the diagonal of a full frame sensor.
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    tianxiaozhang

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #4 on: January 25, 2014, 10:15:43 AM »
    Should be a popular one if it comes out for FF...

    ewg963

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #5 on: January 25, 2014, 10:31:30 AM »
    I wish it was f/2.8...
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    Ricku

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #6 on: January 25, 2014, 10:44:15 AM »
    Nikon and their legendary 14-24mm f/2.8G ED..

    The only wide-angle zooms that Canon makes that come close are 16-35mm f2.8L II
    The 16-35 is not close at all. The focal range yes, but not the performance, esp in the corners!
    « Last Edit: January 25, 2014, 10:46:22 AM by Ricku »

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #6 on: January 25, 2014, 10:44:15 AM »

    Tom W

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #7 on: January 25, 2014, 10:52:25 AM »
    "image height" would give the radius of the image circle. Double that is enough to cover the diagonal of a full frame sensor.

    Thank you! It's unusual for me, but I decided to withhold my opinion until I learned what "Y" was. :)

    Yes, if it's full frame and of good quality, I would be wanting this lens badly! Heck, I could use it on the cropper also.

    ewg963

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #8 on: January 25, 2014, 10:53:20 AM »
    Nikon and their legendary 14-24mm f/2.8G ED..

    The only wide-angle zooms that Canon makes that come close are 16-35mm f2.8L II
    The 16-35 is not close at all. The focal range yes, but not the performance, esp in the corners!
    +1
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    tianxiaozhang

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #9 on: January 25, 2014, 11:01:22 AM »
    I wish it was f/2.8...

    The price might go near $3000 for that...

    Ruined

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #10 on: January 25, 2014, 11:06:49 AM »
    If they released this, it would be the ultimate landscape zoom assuming the optics are good...

    A perfect fit between the more effect-driven 8-15mm f/4 fisheye and the event-oriented 16-35mm f/2.8...

    Hope this one comes out!  Given Canon's current lineup, it makes more sense than a 14-24 f/2.8.
    « Last Edit: January 25, 2014, 11:08:34 AM by Ruined »

    Ruined

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #11 on: January 25, 2014, 11:10:52 AM »
    I wish it was f/2.8...

    Just out of curiousity, why?  I mean, practically, and not just because you want a collection of f/2.8 or faster lenses :)

    24mm is too wide for events & people (where you might want the speed) due to the distortion, so odds are 99% of the use of this will be for landscape.  Landscape is f/8+ most of the time...  And the wide side we already have the 16-35mm f/2.8 for events & people - whose focal length is actually long enough to shoot people without unflattering distortion.

    It is possible the f/4 design might reduce cost, size, weight, and actually improve image quality at smaller apertures where this would be used 99% of the time.
    « Last Edit: January 25, 2014, 11:16:51 AM by Ruined »

    willis

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #12 on: January 25, 2014, 11:12:08 AM »
    Cool patent, but just make it F2.8 ::)
    Would be amazing landscape lens and for star photography.
    « Last Edit: January 25, 2014, 11:13:46 AM by willis »
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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #12 on: January 25, 2014, 11:12:08 AM »

    christianronnel

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #13 on: January 25, 2014, 11:17:04 AM »
    ... Can Canon produce an optically superior lens that also has such a shallow depth of field?

    Just curious, why do you need shallow depth of field for this focal length? 
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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #14 on: January 25, 2014, 11:20:21 AM »
    Cool patent, but just make it F2.8 ::)
    Would be amazing landscape lens and for star photography.

    Comparing the 16-35 f/2.8 and 17-40 f/4, the 17-40 actually performs better at small apertures than the 16-35 f/2.8.  Small apertures is where most of landscape work is done, thus the f/4 may actually be preferable to f/2.8 for landscape.

    In terms of star photography, it is doubtful you are going to get anything better than the 8-15mm fisheye, 24mm f/1.4, or 24-70 f/2.8 II - all great existing options for stars.

    This lens would likely fill the hole in ultrawide rectilinear zoom while preserving quality at small apertures for landscape which an f/2.8 lens might not be able to do as well.
    « Last Edit: January 25, 2014, 11:22:05 AM by Ruined »

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    Re: Patent: Canon 11-24mm f/4 Lens
    « Reply #14 on: January 25, 2014, 11:20:21 AM »