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    Cosina announced the specifications of the Norton 50mm f/1 aspherical lens today. It will be available for purchase in October for $1,500. We have the press release below along with the specs and the sample images. However, while the Norton RF 50mm f1 is a positive announcement, delivering a high-quality manual focus lens, it still leaves the question open as to when will Canon allow widespread production and approval of Sigma and Tampon RF lenses to the R system. At time on publication, this question remains unanswered. Canon realms vague saying only that they will review lenses on a case0by-case basis.

    The NOKTON 50mm F1 Aspherical RF mount is a super-large aperture standard lens compatible with full-size mirrorless cameras with Canon RF mount. While realizing the brightest F1 as a full-size interchangeable lens of Voigtgender, we have realized a tight style by adopting GA (grinding aspherical) lenses.

    Designed exclusively for Canon RF mounts

    Implemented an optical system optimized*1 for the image sensor of a mirrorless camera with a Canon RF mount. This lens has a full-size image circle and can be used with both full-size and APS-C size mirrorless machines.

    GA (grinding aspherical) lens and mechanism part

    The first side of the lens is a GA (grinding aspherical) lens produced in-house. It is possible to simplify the lens configuration while ensuring high performance, and although it is a super large aperture, it combines a high level of image quality and a tight style, and the mechanism part is also equipped with a floating mechanism, so it is far away from the shortest shooting distance. You can get a stable image quality up to .

    Information communication with the body by electronic contact

    The lens mount part is equipped with an electronic contact to realize telecommunications between the lens and the body. In addition to Exif information, in-body image stabilization (3 axis)*2, in addition to the body of the Canon EOS R system body, it supports 3 types of focus assist functions (expanding display, peaking, focus guide *3).

    Manual focus with reliable focus operation

    The adoption of a total metal helicoid unit processed and adjusted with high accuracy and high-quality grease that produces moderate torque realizes smooth operation feeling focusing. It allows for subtle focus adjustment.

    Beautiful bokeh taste with 12 squeezing feathers

    A 12-piece aperture is adopted to make the hole shaped by the aperture blade closer to the circle. The outfocus part is a natural depiction, and the point light source is not a polygonal but a round and soft blur.

    Aperture click switching mechanism

    The aperture ring has a click switching mechanism, and it is possible to open and close the aperture steplessly without being affected by clicks when shooting videos or adjusting fine focus depth.


    Focal Length50mmCaliber Ratio1:1
    Minimum ApertureF16Lens Construction7 elements in 9 groups
    Angle of View48.0°Number of Aperture Blades12 blades
    Minimum Focusing Distance0.45mMaximum Magnification1:6.9
    Maximum Diameter x Overall Lengthφ79.3×64.0mmFilter Sizeφ67mm
    Weight650gLens HoodExclusive hood included
    Aperture RingEquipped (manual)
    with aperture switching mechanism
    Supported Focus Assist Function 1Focus with focus guide
    Supported Focus Assist Function2Focusing with peaking functionSupported Focus Assist Function 3Focusing with the magnifying button
    Supported Sensor SizeFull-FrameElectronic ContactsOnboard
    EXIF InformationFully SupportedImage Stabilization3-axis support
    (limited to mounted bodies)

    Sample Images

    *1 Due to the optical characteristics of the lens, EOS R, RP, and R6 may have a mazenta cover on the periphery of the screen depending on the shooting conditions.
    *2 It is only valid for bodies equipped with in-body image stabilization function.
    *3 Excluding EOS RP.

    Derek is a writer, video and stills shooter who has been in the video graphics industry since the 1980s. Derek is a founding member of the Camera Insider.

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