Patent: Canon RF 135mm f/1.4L DS USM optical formula

Canon Rumors Guy

Canon EOS 40D
CR Pro
  • Jul 20, 2010
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    2,395
    Canada
    www.canonrumors.com
    More optical formulas for large aperture RF mount prime lenses have appeared. This new patent showcases some RF mount prime lenses that utilize Defocus Smoothing, which first appeared in the RF 85mm f/1.2L USM DS.
    Canon RF 24mm f/1.4L USM DS

    Focal length: 24.55mm
    F-Number: 1.45
    Half angle of view: 41.39°
    Image height: 21.64mm
    Overall length: 119.13mm
    BF: 38.01mm

    Canon RF 50mm f/1.4L USM DS

    Focal length: 52.13mm
    F-Number: 1.45
    Half angle of view: 22.54°
    Image height: 21.64mm
    Overall length: 85.51mm
    BF: 37.71mm

    Canon RF 135mm f/1.4L USM DS

    Focal length: 131.00mm
    F-Number: 1.41
    Half angle of view: 9.38°
    Image height: 21.64mm
    Overall length: 182.28mm
    Back focus: 13.87mm

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    H. Jones

    Photojournalist
    Aug 1, 2014
    785
    1,594
    I won't be surprised at all if the 135mm F/1.4 also gets released as a DS option.

    Someone mentioned sequential lens IDs in certifications are often variants of the same lens, right? Canon could be gearing up to announce the 135mm f/1.4 and its DS counterpart as "two" lenses.

    I do feel like we need a fast 35mm before we get another portrait lens, but this will be one heck of a statement lens with DS at that aperture and focal length.

    Would be interested to see if DS really even makes all that much of a difference at 24mm. I can't imagine the bokeh is *that* much better.
     
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    Chig

    Birds in Flight Nutter
    Jul 26, 2020
    532
    802
    Orewa , New Zealand
    As the owner of a Canon EF 135 f/2 for 15 years, I can't think of a single instance where f/1.4 would have been a great advantage, especially if the cost of the f/1.4 lens is $5000+.
    I'll stick with my EF 135mm f/2.8 soft focus lens which cost me USD 240 (NZD 370) including shipping and sales tax on eBay.
    It's super light and an amazing lens for the money (and the soft focus feature is fun to play with)
     
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