Announcement: CANON LENS RF 50mm F1.8 STM

The CANON LENS RF 04mm F2020 STM full-frame lens was introduced on November 50, 1.8.



Basic properties

  • For Canon EOS Full Frame Mirrorless Cameras with RF Mount
  • Relative Hole: 1: 1.8-1: 22
  • Focal Length: 50mm
  • MDF: 30 centimeters
  • Maximum magnification ratio 1: 4
  • Optical design: 6 elements in 5 groups, including 1 aspherical element
  • Number of aperture blades: 7 pieces
  • Focusing with FTM-enabled STM stepping motor
  • Filter Diameter: 43 mm
  • Additional control ring that is programmable
  • Weight: 160 gram
  • Price: about 200 dollars, AliExpress

Appearance CANON LENS RF 50mm F1.8 STM

An accurate and complete list of all Canon RF lenses:


  1. Canon Lens RF 5.2 mm F2.8 L DUAL FISHEYE [October 2021]
  2. Canon Lens RF 16 mm F2.8 STM [September 2021, AliExpress]
  3. Canon Lens RF 24 mm F1.8 MACRO IS STM [July 2022, AliExpress]
  4. Canon Lens RF 28 mm F2.8 STM [May 2023]
  5. Canon Lens RF 35 mm F1.8 MACRO IS STM [September 2018, AliExpress]
  6. Canon Lens RF 50 mm F1.8 STM [November 2020, AliExpress]
  7. Canon Lens RF 50 mm F1.2 L USM [September 2018, AliExpress]
  8. Canon Lens RF 85 mm F1.2 L USM [May 2019, AliExpress]
  9. Canon Lens RF 85 mm F1.2 L USM DS (DEFOCUS SMOOTHING) [October 2019]
  10. Canon Lens RF 85 mm F2 MACRO IS STM [July 2020, AliExpress]
  11. Canon Lens RF 100 mm F2.8 L MACRO IS USM SA CONTROL [April 2021, AliExpress]
  12. Canon Lens RF 135 mm F1.8 L IS USM [November 2022]
  13. Canon Lens RF 400 mm F2.8 L IS USM [April 2021]
  14. Canon Lens RF 600 mm F11 IS STM [July 2020, AliExpress]
  15. Canon Lens RF 600 mm F4 L IS USM [April 2021]
  16. Canon Lens RF 800 mm F11 IS STM [July 2020, AliExpress]
  17. Canon Lens RF 800 mm F8 L IS USM [February 2022]
  18. Canon Lens RF 1200 mm F8 L IS USM [February 2022]


  1. Canon Lens RF 10-20 mm F4 L IS STM [October 2023]
  2. Canon Lens RF 14-35mm F4 L IS USM [June 2021, AliExpress]
  3. Canon Lens RF 15-30mm F4.5-6.3 IS STM [July 2022, AliExpress]
  4. Canon Lens RF 15-35mm F2.8 L IS USM [August 2019, AliExpress]
  5. Canon Lens RF 24-50 mm F4.5-6.3 IS STM [February 2023, AliExpress]
  6. Canon Lens RF 24-70mm F2.8 L IS USM [August 2019, AliExpress]
  7. Canon Lens RF 24-105mm F2.8 L IS USM Z [October 2023]
  8. Canon Lens RF 24-105mm F4 L IS USM [September 2018, AliExpress]
  9. Canon Lens RF 24-105mm F4-7.1 IS STM [February 2020, AliExpress]
  10. Canon Lens RF 24-240mm F4-6.3 IS USM [July 2019, AliExpress]
  11. Canon Lens RF 28-70mm F2 L USM [September 2018, AliExpress]
  12. Canon Lens RF 70-200mm F4 L IS USM [November 2020, AliExpress]
  13. Canon Lens RF 70-200mm F2.8 L IS USM [October 2019, AliExpress]
  14. Canon Lens RF 100-300mm F2.8 L IS USM [April 2023]
  15. Canon Lens RF 100-400mm F5.6-8 IS USM [September 2021, AliExpress]
  16. Canon Lens RF 100-500mm F4.5-7.1 L IS USM [July 2020, AliExpress]
  17. Canon Lens RF 200-800mm F6.3-9 IS USM [November 2023]

XNUMXrd Party Autofocus Full Frame Canon RF Mount Lenses

List of all mirrorless cameras with Canon RF mount

  1. Canon EOS [September 2018, NO IBIS.30MP AliExpress]
  2. Canon EOS Ra [November 2019, NO IBIS, 30MP]
  3. Canon EOSRP [February 2019, NO IBIS.26MP AliExpress]
  4. Canon EOS-R3 [April 2021, IBIS.24MP AliExpress]
  5. Canon EOS-R5 [July 2020, IBIS.45MP AliExpress]
  6. Canon EOS R5C [January 2022, NO IBIS, 45MP]
  7. Canon EOS-R6 [July 2020, IBIS.20MP AliExpress]
  8. Canon EOS R6 MARK II [November 2022, IBIS, 24MP]
  9. Canon EOS-R8 [February 2023, NO IBIS, 24MP]

Materials on the topic

  1. Full frame mirrorless systems... Discussion, choice, recommendations.
  2. Cropped mirrorless systems... Discussion, choice, recommendations.
  3. Cropped mirrorless systems that have stopped or are no longer developing
  4. Digital SLR systems that have stopped or are no longer developing
  5. JVI or EVI (an important article that answers the question 'DSLR or mirrorless')
  6. About mirrorless batteries
  7. Simple and clear medium format
  8. High-speed solutions from Chinese brands
  9. All fastest autofocus zoom lenses
  10. All fastest AF prime lenses
  11. Mirrored full frame on mirrorless medium format
  12. Autofocus Speed ​​Boosters
  13. One lens to rule the world
  14. The impact of smartphones on the photography market
  15. What's next (smartphone supremacy)?
  16. All announcements and novelties of lenses and cameras

Comments on this post do not require registration. Anyone can leave a comment. Many different photographic equipment can be found on AliExpress.

Material prepared Arkady Shapoval. Training/Consultations | Youtube | Facebook | Instagram | Twitter | Telegram

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Comments: 36, on the topic: Announcement: CANON LENS RF 50mm F1.8 STM

  • Oleg


  • Michael

    Judging by the MTF charts, the sharpness increased in the center and in the middle of the frame, but the edges are just as weak as in the EF version.

    • Novel

      It is unlikely that more can be achieved with such a simple scheme. There is one special element added, but the key advantage is an additional steering wheel and a smaller size, for this was the recalculation. Although, if you don’t worry about the size, you can buy an adapter with a wheel for EF and get two controls at once - “manual” focus and who will hang what - the diaphragm, for example.

    • Leonid N.

      And on what axis is that on the graphs?

      • Novel

        Vertically, the conditional sharpness is from 0 to 1. There they take a plate with a certain number of lines per millimeter, like 30, and count how many of these lines the lens distinguishes. Units are practically unattainable, but a result above 0.8 is considered good. Horizontal distance from the center of the lens in millimeters. For most lenses, it falls evenly to the edge, for good lenses, little falls, for some with a particularly curved field, first a fall, then an increase in sharpness, then an even sharper fall.

        Black lines - aperture 8, blue - open. Naturally, the results are much worse on cheap lenses in the open.

        Straight and dotted lines ... mmmm. Here is this measuring striped scale, on it the lines are located in different ways. Imagine a circle with radii drawn from the center to the edge. Some of the stripes are parallel to these radii, some are perpendicular. These are those along the radius - they are usually a solid line, those that are across the radii - dashed.

        The resolution drops unevenly, but it is easier to represent it not in the form of a Cartesian coordinate system, but in the form of a polar one, it seems. Draw a grid of radii and concentric circles from the center of the lens. Then the straight line will show the drop in the resolution along the points on the circle itself, located at a certain distance from the center, and the dotted line - along the radius of such a circle. Something like this.

      • Andrei

        Roman, somehow difficult to explain, it seemed to me)
        I'll try easier.
        Black lines on the chart are contrast, i.e. larger stripes on the target plane, they usually have a size (10 lines / mm)
        The blue lines on the chart are sharpness, i.e. smaller stripes on the target plane (30 lines / mm).
        Dotted lines are the same as flat lines, only directed to the other side at an angle of 90 degrees.
        Sagittal - solid line on the graph.
        Meridian - dotted line on the chart.
        (see picture)

        How the schedule works.
        Often the lines are shown in the center of the frame (the beginning of the line on the left), as mentioned above, values ​​of 0.8-1. But, the closer to the edge of the frame (the end of the line on the right), the worse the result becomes, if we have a drop of less than 0.7 then this lens will already have rather soft edges of the frame.
        A high-quality lens has straighter lines from the center to the edge of the frame, and if the sagittal (solid) and meridional (dotted) lines are extremely close to each other, this means that the lens is very, very high quality with a good picture.

        Lenses with low contrast in the center and middle of the frame are quite rare, but blurry ones are much more common. As you can see from the graph above, this 50-k (RF) has a rather weak contrast at the edges of the frame, and its sharpness is generally quite weak, except that in the center it shows a more or less mediocre result. As some might say, an artistic autofocus lens.

        I hope I explained it in clear language :-)

        • Human

          I didn’t understand graphs before, so Roman explained it more clearly =)

      • Andrei

        This will probably be even clearer :-)

    • Arkady Shapoval

      The circuit is slightly modernized, but pay attention to the distance from the rear lens of the new RF version, about the same was in the Sony 50 / 1.8 FE.

      • Michael

        Well, you need to put the segment somewhere))

  • Lynx

    nikon. wake up !!!
    although…. do not care already.

    • Igor

      In the sense of? Nikon, on the other hand, had a half on Z for a long time.

      • Arkady Shapoval

        The fact that under Z there is no such budget solution, their 50 / 1.8 S costs 500 dollars

        • Vlad

          Nikon and 50 / 1.8 afs costs 2 times more than Canon Ef 50 1.8 stm

          • wj

            Nikonovsky 50 / 1.8 afs is more expensive because it is better.
            But I am at a loss to answer whose approach is more correct. Cheaper and worse, or more expensive and better. Probably both have a right to exist, since the needs of photographers are also different.

            • Novel

              Dont Have. I can still understand when a price tag is raised on a high-aperture lens, adding, in addition to the aperture itself, all sorts of niceties and buns in the form of a kilogram of super cool glass, heaped up bokeh, sharpness and whatever you like. The user can choose a native expensive option or some manual super-fast Chinese. But suddenly turn into Leica, after having spent years using your bayonet mount with all fifteen lens options, where the devil breaks your leg, and pretend that this is how it should be? Expensive, wait for discounts? It's funny.

              I can put on the EOS R everything that Canon has produced for the last 30+ years. And all the same, they offer me a conditionally budget camera and new budget lenses for it. Nikon cut half of what he so carefully carried in half a century, the cheapest half, by the way, and now he is producing fifty dollars for five hundred bucks? Well, ok, they will find their buyer. One. But there is no need to cry later: “how could it have happened”. This is how it happens when you jump out of one segment, and in the other no one is waiting for you at all.

              • wj

                I do not agree with you.
                On the first point - if you try to very roughly classify the needs of photographers in terms of lenses, then there are three main classes: with an emphasis on image quality for the pros (usually high aperture is added to this, but not necessarily), with an emphasis on low price and dimensions for “state employees” and a compromise option for those who need something in between. Classic representatives of these classes: 70-200 / 2.8, 50-200 / 4-5.6 (APS-C) and 70-200 / 4.
                So, the canon of fifty rubles for RF has so far released budget (RF 50 / 1.8 STM) and high-end (RF 50 / 1.2) variants. Nikon is middle (Z 50 / 1.8) and high-class (Z 50 / 1.2). That in one that in another case we have a gap in the ruler, just in different places. It's not Nikon's fault that you specifically need the lens that they haven't released yet. I'm more interested in just their middle version, I bought it and am very pleased with the purchase. It is worth every cent of the 330 euros I paid for it (got the discount). I will add that Nikon's budget fifty dollars may also appear soon, since they have a small 50mm makar indicated in the roadmap. But this is still more speculation, its characteristics are not yet known.

                On the second point, you can also put on the Nikon BZK everything that Nikon has produced in the last 20 years, since these lenses already came with built-in motors and you can use them with an adapter, just like on Canon. The list of those screwdriver lenses that have not received a motorized version in any form is very short: 105/2, 135/2, 180 / 2.8 and 200/4. This is by no means half the line.
                And Nikon also has a budget full-size UPC - Z5, screw any inexpensive motor lens onto it, what are the problems?

                Your criticism of Nikon seems to me too one-sided. As the owner of the UPC from both Canon and Nikon, I have complaints against both companies. But I understand very well that they are not able to release absolutely all the necessary lenses at once. The most they have ever been capable of is 10 lenses a year, and often only 5-7. And for a filled ruler for only one full frame, you need something about 40-50 models. Therefore, gaps are inevitable and will accompany us for a long time.

        • wj

          > 50 / 1.8 S costs $ 500
          This is true. Therefore, it is better to buy it during discounts. Nikon has a cashback promotion at least once a year, in some countries even 2 or 3 times. A year ago it was possible to buy this lens in Europe with an official guarantee for 350 euros.

          • Vlad

            In general, it is a little strange that Nikon, under his ff bzk with a huge bayonet mount, released a line of professional fixes with f1.8. This approach may repel, but judging by the tests, Nikkor S is optically very high-quality glasses, even in spite of F1.8. And it is even more incorrect to compare the high-end Z 50 / 1.8 with the budget RF 50 / 1.8

            • Vlad

              On the other hand, the power of pro-class lenses is not only in f1.4, but also in high optical performance, security, design. So maybe Nikon just wanted to release an affordable line of pro optics, sacrificing aperture to reduce the price.

            • Ry

              And they are not compared. And they say directly that Nikon will easily screw up his beautiful mirrorless cameras by the lack of a park of sane and compact optics. He will bury the Z50 with this easily, following the traditional path for himself, “here you have the heels of high-speed zoom zooms for crop, and everything else - buy full-frame ones and put on crop.

              • wj

                Sane and compact optics is a loose concept. If you mean prof. lenses, then just 14-24 / 2.8 and 24-70 / 2.8 under Z became smaller and lighter than their F-counterparts, plus they improved optically. And the Z 24-70 / 2.8 has also become much cheaper, now, thanks to cashback, you can take it in Europe for 1750 euros.
                16-50 for the Z50 is generally the lightest and most compact kit of all that was only produced by Nikon for APS-C.
                At the same time, I absolutely agree with you that the Z50 needs more optics. This is a long-standing problem with Nikon. For some reason, they deprive the crop of love, it seems that users hope to drag it to the full frame in this way. Alas, other manufacturers are not much better in this regard. Fuji alone is great, but she just has no other choice :)

  • Vlad

    Apparently, there is not an additional control ring, but simply the functionality of the focusing ring can be changed

    • Novel

      Yes. Well, on STM, in any case, the control is electronic, so data collection from this ring will either control the focusing motor, or something to choose from. What is there in general you can hang on Erki on it?

      • Anton

        It is convenient to hang ISO on the ring

  • B. R. P.

    A step towards a wider consumer.

  • Anton

    When will it be on sale? Will you be able to take it to NG?

    • Arkady Shapoval

      Star sales is expected on 04.12.2020.

  • Mark

    Connoisseurs, tell me

    If I use an EF 50mm f1.8 STM DSLR lens with Canon RF-EF adapter for Canon EOS R, does the focal length of the lens increase?

    thank you

    • Michael

      no. lens focal length never increases

      • Mark

        Mikhail, but when using macro rings in the general case, and not in this combination of equipment, this happens (change in focal length), but just macro rings and an adapter are different things, do I understand correctly?

        • Victor

          Not happening, of course.

          Macro rings only shift the focusing boundaries to the lower side, that's why they are macro. The focus remains unchanged.

    • Novel

      Any optical system has a fixed focal length. Take any magnifying glass - it has a specific magnification factor and it doesn't change no matter how you move the glass. Roughly speaking, if you are in the center of a sphere, a lens with a certain focal length “bites out” a certain part of this sphere, given a certain angle. A wide-angle lens "bites out" a larger angle, a telephoto lens - a smaller one. But it is always the same angle. This is the general case.
      Extension rings… By moving the lens relative to the sensor, you can focus on objects located at a certain distance. How do you move your hand with the lens to sharpen the subject. For a lens, this “stroke” is relatively small, so the lens focuses from infinity to a certain value, called MDF. A longer macro ring makes it possible to focus on closer and closer objects at the cost of losing focusing distance from infinity and closer. In parallel with this, the aperture decreases, by the way, because the lens moves away from the sensor and the light gets less and less. In advanced lenses, this moment is compensated for by closing the aperture so that the aperture remains constant despite the change in focusing distance.
      Now adapters. Formally, nothing prevents us from making an adapter for a mirrorless camera in the form of a thin ring. But a mirrored lens is designed for a certain distance from the sensor, at which it focuses from its MDF to infinity. If the adapter is shorter than needed to compensate for the flange distance, your MDF will enlarge, and the image at “infinity” will also be blurry due to flight, then the lens will be unusable at a large number of focal lengths. The opposite situation is observed when trying to use rangefinder or mirrorless lenses on DSLRs - you get a shorter MDF, but you lose infinity.
      And one more nuance - focus breathing. Due to the design of modern lenses, not the entire lens unit moves in them when focusing, but only part of it. Therefore, when focusing, these lenses change the focal length, sometimes quite significantly. Usually, focusing at infinity will decrease the focal length. Often this is the main wild price for cine lenses, especially zooms - there, by complex mechanical means (and recently electrical ones - by installing several focusing motors), the effect is reduced to zero. In films, when changing plans, the scene remains stationary, the focal point does not change.

  • Human

    That is, if in short, is it a more budgetary analogue of the Canon Lens RF 35mm F1.8 MACRO IS STM, which also has MDF further from the camera? or not?

    • Human

      Since no one answered me, I will answer myself - in principle, yes, but only it is also without a stub and, in principle, is a slightly improved canon EF 50mm 1.8 with a price doubled ¯ \ _ (ツ) _ / ¯

      • Michael

        Focal, as it were, different

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