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    Canon announces the Canon RF 10-20mm f/4L IS STM

    By Updated:117 Comments3 Mins Read Canon Lens News
    rf1020header 1536x518 - Canon announces the Canon RF 10-20mm f/4L IS STM

    MELVILLE, NY, October 11, 2023 – Today, Canon U.S.A., Inc., a leader in digital imaging solutions, announced the launch of the RF10-20MM F4 L IS STM lens, a full-frame ultra wide- angle lens that can help the work of a professional photographer or serious enthusiast stand out from the crowd.

    Opening the door to supreme full-frame visual possibilities, the RF10-20MM F4 L IS STM lens continues Canon's respected reputation for optical excellence associated with L-series lenses. This new addition enhances optical performance with a modern mirrorless lens design that is fully equipped with key features, including:

    • New Image Stabilization (IS) technology, to help minimize wide-angle “fluttering” at outer areas of frame
    • Impressively compact size and light weight (1.25lbs/570g) at half the weight of EF series 11-24mm f/4 L lens
    • Super quiet Canon STM focus drive motor, which is ideal for video and marking the first time this technology appears in a Canon L-series lens

    Speaking directly to the professional video and stills visual storyteller, the RF10-20MM F4 L IS STM features a built-in lens hood and lens function button on the barrel for customizing functions such as AF settings, Pre-Recording, Zebras and more. For landscapes, cityscapes, architectural, real estate and weddings, the RF10-20MM F4 L IS STM lens is a widely important lens for any professional to have at the ready.

    Pricing & Availability

    The Canon RF 10-20mm f/4L IS STM begins shipping on November 2, 2023.

    Technical Specifications

    Optical Design
    Lens Construction16 elements in 12 groups
    Special Elements1 super UD lens, 3 UD lenses and 3 aspheric lenses
    Lens CoatingCanon SSC (Super Spectra Coating), SWC (Subwavelength structure coating), ASC (Air Sphere Coating), Fluorine coating.
    Filter Size DiameterNone (inserted in gelatin filter holder at the rear of the lens)
    Aperture Blades9
    Image Stabilization5.0 stops correction with In-lens Optical Image Stabilization (6.0 stops correction with EOS R series in-body coordinated Image stabilization)
    Focusing
    Focusing Drive SystemCanon STM (Leadscrew type STM)
    Full-time Manual FocusingYes
    (Supports both ONE SHOT AF and SERVO AF with compatible EOS R-series cameras)Dual Pixel CMOS AF Coverage@999br/> (Horizontal x Vertical)
    • EOS R5 — Approx. 90% x 100% (Approx. 100% x 100% when using face and tracking-priority)
    • EOS R — Approx. 88% x 100%
    • EOS R7/R10 — Approx. 90% x 100% (approx. 100% x 100% when subject is detected, or with Whole Area AF active)
    Exterior Design
    Control RingYes, with click stops
    (click stops can be removed by a Canon service facility, for a fee)
    Manual Focus RingElectronic ring system
    • Full-time Manual focus possible
    • No physical limit to ring rotational angle
    AF/MF SwitchYes; AF/MF
    MF/Control Ring SwitchNo
    Distance ScaleNone (Electronic distance scale possible in viewfinder or LCD monitor, with compatible EOS R-series cameras)
    Distance Limiter SwitchNone
    Dust / Weather Resistant ConstructionYes
    Dimensions, Weight
    Maximum Outer Diameter x LengthApprox. ø3.3 in. (ø83.7mm) x 4.4 in. (112mm)
    WeightApprox. 20.1 oz. / 1.3 lbs. / 570g
    Accessories
    Lens hoodbuilt into lens body
    Lens Cap(Front) Canon Lens Cap 10-20 (Bundled)
    Dust CapCanon Lens Dust Cap RF (Bundled)
    Lens CaseCanon Lens Case LP1219 (Bundled)
    Extension TubesNone (No Canon RF mount extension tubes)
    Close-up Lenses 250D / 500DNot Compatible
    Canon RF Extender 1.4x/2xNot compatible
    Canon Gelatin Filter Holder III/IVNot compatible — gelatin filter holder on the rear of the lens.
    Canon RF10 20mm 02 1 728x582 - Canon announces the Canon RF 10-20mm f/4L IS STM
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    117 comments

    1. The EF 11-24 is one of my most used lenses, especially for landscape. Despite its f4 this lens is also great for astro (11mm - very good coma correction …). The only downside is its weight. Now, the new RF version is much lighter and this fact makes it very attractive to me. Provided an optical performance at least at the s of the EF version I think I could accept the compromises: 20 instead of 24 mm at the longer end and no possibility to use filters.
    2. Wow, the weight on this lens is absolutely awesome. I don't think I'm in the market for this one (I´ve got the 14-35mm F4) but I am really intrigued. The only downside so far (we´ll have to wait for tests) is it uses a STM motor instead of a USM motor.
    3. Wow, the weight on this lens is absolutely awesome. I don't think I'm in the market for this one (I´ve got the 14-35mm F4) but I am really intrigued. The only downside so far (we´ll have to wait for tests) is it uses a STM motor instead of a USM motor.
      The 11-22mm EF-M was STM, but because it's so wide things just don't have to move that much. It does provide FTM which is usually not there on STM lenses, so there's probably not really much of a downside.
    5. The 11-22mm EF-M was STM, but because it's so wide things just don't have to move that much. It does provide FTM which is usually not there on STM lenses, so there's probably not really much of a downside.
      It’s a fake FTM, though, since backdriving a leadscrew is a bad idea, mechanically speaking.
      Another software thing Canon only doles out to ‘deserving’ lenses…
    6. Canon seems to have really shut down rumors lately. The RF 28mm f2.8 showed up as a rumor only a few days before it was announced and this one was less than 24 hours. It seemed before we would have really reliable rumors about specs weeks before the announcement.
    7. Before you read what I’m writing here, I’ll just say one thing. If you love going really wide and even wider and have been waiting for your dream lens on the RF mount, then don’t waste time finishing reading this article before you preorder. Simply. Do. It. Now. I remember a time when Canon’s ultra-wide

      See full article...
    11. It’s a fake FTM, though, since backdriving a leadscrew is a bad idea, mechanically speaking.
      Another software thing Canon only doles out to ‘deserving’ lenses…
      You aren't racking focus on a 70-200mm though. the amount of movement is pretty small.
      I think it's more a size and weight thing than a "deserving" thing.
    16. You aren't racking focus on a 70-200mm though. the amount of movement is pretty small.
      I think it's more a size and weight thing than a "deserving" thing.
      But all RF L lenses get the software based FTM, including the 100-500L, so I'm not completely convinced it's a purely technical issue. Having said that, the L lenses tend to have nano-USM. My counter examples would include the 16,28 and 50mm STM primes :)
    19. Here is the MTF chart comparison between the new lens and the EF 11-24mm.
      Source: the-digital-picture
      View attachment 212182
      I think the 11-24 MTF is using the old method of calculating it, Canon changed it a few years ago to be more realistic (lower numbers), but Canon USA is too lazy to update their website :(.

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