Canon officially announced the development of six RF mount lenses including 70-200mmf/2.8,Canon officially released the RF70-200mmF2.8LISUSM lens
In the telephoto lens, Canon has always had an impressive performance, whether it is the EF70-200mmf/2.8LISIIIUSM lens known as the “Love the Little White Umbrella”, or it is compact while maintaining high The picture quality EF70-200mmf/4LISIIUSM lens and the Canon telephoto lens with the iconic white casing always have a good performance. From the end of 2018 to the beginning of 2019, Canon released EOSR and EOSPR two full-frame special micro-systems, marking the launch of the RF special micro-system. In February of this year, Canon officially announced the development of six RF mount lenses including 70-200mmf/2.8. In October of the same year, Canon officially released the RF70-200mmF2.8LISUSM lens, and recently we also officially got it. This lens is evaluated.
as an RF card The first large-aperture telephoto lens, RF70-200mmF2.8LISUSM, has received a lot of attention since its release.
Canon RF70- 200F2.8LISUSM unboxing photo
This lens uses 13 groups With 17 optical structures, one glass molded aspheric lens and one UD aspheric lens have realized spherical aberration correction and miniaturization of the zoom lens. The 3 UD lenses and 1 super UD lens also greatly help the image quality. In addition, the lens also applied Canon SWC sub-wavelength structure coating. SWC coating has excellent anti-reflective properties, especially for light with a large incident angle, which can reduce the possibility of glare and ghosting at the edge of the lens with large curvature. Although the data is beautiful, its overall quality must be reflected in actual use. The analysis of the lens starts with the introduction of its appearance.
Introduction to the appearance of lens
Canon RF70-200mmF2.8LISUSM lens front
Canon’s RF70-200mmF2.8LISUSM lens still uses the iconic white design of Canon’s telephoto lens, even though this white heat-insulating coating It can also reduce the increase in lens temperature caused by long-term shooting under the scorching sun. This lens also uses a waterproof, drip-proof and dust-proof structure. Sealing measures are implemented at the lens joint and switch surface to effectively prevent the intrusion of water droplets and dust.
Canon RF70- 200mmF2.8LISUSM lens side
Canon RF70-200mmF2.8LISUSM lens side
The extended state of the lens at 135mm and 200mm respectively
Canon EOSR with RF70 -200mmF2.8LISUSM lens
The size of this lens is 89.9*146mm, and the overall weight is 1070g. Compared with the EF70-200mmf/2.8LISIIUSM lens with a weight of 1480g on the EF mount SLR, its weight and volume are There is a certain reduction and reduction in the above. It uses the design of the zoom ring in the front, the focus ring in the center, and the control ring in the back. The left side of the lens has a focus limit lever, focus mode switch lever, anti-shake switch lever, and anti-shake mode lever, while on the right is a zoom lock to prevent the lens from extending due to gravity.
focus limit Shift lever and focus mode lever
Anti-shake switch lever and anti-shake mode lever
Canon RF70-200mmF2.8LISUSM lens zoom lock
This lens adopts a water-drip and dust-proof structure, and the lens joint and switch surface are sealed. Effectively prevent the intrusion of water droplets and dust. Not only that, but the lens is designed to take into account the negative pressure generated during expansion and contraction that will inhale air, which may bring in dust. The air path is preset to control the air flow direction, and the joints are dustproof, breathable and prevent moisture intrusion. The material that solves the problem of easy dust in the structure of the telescopic lens. In addition, the front and rear lenses are equipped with anti-fouling fluorine coating, which is not easy to adhere to dust and stains, and can easily wipe off the oil on the lens with a dry cloth, which can effectively cope with the harsh shooting environment.
Canon RF70- The filter size of the 200mmF2.8LISUSM lens is 77mm
Canon RF70-200mmF2.8LISUSM lens rear lens group
Since the Canon RF70-200mmF2.8LISUSM lens has a large reduction in size, Canon has also equipped this lens A new small tripod mount is provided, and an alignment line is provided on the mount to facilitate alignment with the lens during installation, so as to easily switch the horizontal and vertical composition.
This lens also comes with a EF-83F shading The hood and the lens hood are also painted in white, and have buckles to prevent falling off. It has a strong consistency with the lens. The inside of the hood uses a threaded matting design to reduce unnecessary light entering the lens. In addition, the hood has a sliding circular polarization filter adjustment window. When shooting with a polarization filter, you can adjust it without removing the hood.
Canon RF70- 200mmF2.8LISUSM lens with hood
Lens hood installation/removal snap
threaded matte design is used inside the hood
Filter adjustment frame on the hood
Canon EOSR body with RF70-200mmF2.8LISUSM lens with hood installed
The Canon RF70-200mmF2.8LISUSM lens uses an external zoom design. The common focal lengths of 70, 100, 135 and 200 are marked on the lens body. The zoom ring is wide and the texture is delicate. The zoom stroke is about 90 degrees. The zoom and focus are The experience is excellent.
lens model identification
lens certification mark
The closest focusing distance is 0.7m
Overall, compared to the EF70 on the EF mount -200mmf/2.8LISIIIUSM lens, RF70-200F2.8LISUSM lens has been reduced in size and weight, which can be well adapted to the miniaturized EOSR body.
In the resolution test, we tested the real image quality of the Canon RF70-200mmF2.8LISUSM lens at 70mm and 200mm focal lengths at each stop. Take 100% screenshots of the center and edge positions. Our test body is Canon EOSR. At the same time, the tripod is fixed and the lens anti-shake is closed for shooting. First, let’s take a look at the actual performance of this lens at a focal length of 70mm.
At the 70mm end, it has a good performance when the aperture is fully opened. With the shrinking of the aperture, the image quality continues to improve, and it has a very high usability at f/16, and at f/22, the image quality of the lens begins to decline due to the diffraction problem caused by the small aperture. In short, this lens has excellent image quality performance in the commonly used aperture range. The test method for the 200mm end is also the same as the test method for the 70mm end mentioned above.
It can be found that the picture quality is slightly loose when the aperture is fully opened. But it also has a higher usability. The picture quality is very good after shrinking the aperture by one stop, and there has been a very good picture quality performance in the future, with the same edge picture quality. The image quality degradation of the two appears uniformly at f/16. At the telephoto end, if you pursue better picture quality, you only need to shrink the aperture slightly.
As a telephoto zoom lens with a focal length of 70-200mm, it is handheld most of the time during use, and the telephoto is more for shaking Sensitive, so the anti-shake function of the lens is more important. We also tested the anti-shake effect of Canon RF70-200mmF2.8LISUSM lens. In the test, I set the camera to the shutter priority gear, start from the safe shutter speed and reduce the shutter speed step by step to shoot, and take 3 photos at the same time at each shutter speed to see whether the satisfactory anti-shake effect is achieved.
During the real shooting test, 3 shots were taken at each shutter speed Among the photos, if 2 of them are clear, the usability at the shutter speed is deemed high. In the real shooting test, I found that the 200mm focal length of the Canon RF70-200mmF2.8LISUSM lens was 1/13s. Because the jitter exceeded the anti-shake compensation effect, the photo appeared blurry, so I judged that the anti-shake compensation of this lens was about Around 4-5 gears.
In the axial dispersion test, we also fixed the Canon EOSR body on a tripod for shooting, and accurately focused on the target plate under different apertures.” Shoot at the position of 0” to detect the axial dispersion.
even at the maximum Under the aperture, the axial dispersion is also difficult to detect. This is because this lens uses multiple super UD and UD lenses. According to Canon, one super UD lens can provide the effect of two UD lenses, and two UD lenses are It can be close to the effect of a fluorite lens and can achieve good chromatic aberration compensation performance.
We also used a more extreme shooting scene to show Although the purple fringing of this lens has such a high-contrast scene, there is no obvious purple fringing or green fringing on this lens even when the aperture is fully opened, which shows that this lens is facing a high light ratio such as strong light. At times, it has a better performance.
distortion vignetting test
as a 70-200 focal length zoom lens, its distortion and vignetting control are important for the entire lens The overall quality is especially important for the control of distortion. When testing the distortion and vignetting of the Canon RF70-200mmF2.8LISUSM lens, we turned off the in-camera correction function of the Canon EOSR on the test body. We tested the distortion and vignetting performance of this lens at 70mm and 200mm.
Canon RF70- 200mmF2.8LISUSM70mm end distortion real shot
Canon RF70-200mmF2.8LISUSM70mm end distortion real shot
Canon RF70-200mmF2.8LISUSM200mm end distortion real shot
Canon RF70-200mmF2.8LISUSM200mm end distortion real shot
Through actual shooting, I It was found that Canon RF70-200mmF2.8LISUSM did not show obvious distortion, which is quite excellent for a standard telephoto zoom lens. This lens uses a number of special lenses to effectively correct spherical aberration and distortion.
vignetting, also known as corner loss, refers to the large angle between the imaging light of the corner and the optical axis of the lens, which causes the corner loss The main reason for light. Look at the aperture along the forward direction of the light at the edge of the field of view. Since the light is at an angle with the plane where the aperture is located, the aperture seen is elliptical, so the light-through area is reduced. So how does this lens perform with vignetting?
Through actual shooting, the vignetting performance of Canon RF70-200mmF2.8LISUSM is excellent, at 70mm end and 200mm The end is at the maximum aperture, and there is a little vignetting. After shrinking the first or second stop, the existence of vignetting is almost undetectable. If the in-camera lens data correction is turned on, the vignetting phenomenon is completely undetectable even at the maximum aperture. appear.
Similarly, as a large aperture lens with f2.8, let’s take a look at Canon RF70-200mmF2. What is the performance of the out-of-focus spot of the 8LISUSM lens. The Canon RF70-200mmF2.8LISUSM lens uses a 9-piece aperture blade design, which can bring a smooth blur effect. We also made a GIF to show the out-of-focus effect.
Out-of-focus effect when the aperture is fully opened
This lens does not appear “onion ring phenomenon”, but there is a phenomenon of aperture erosion that is often inevitable in large aperture lenses. The loss of light at the edge of the picture makes it difficult for the edge of the light spot to maintain a regular circle. Of course, this is an effect of different opinions. If used properly, you can get a very beautiful bokeh. In short, when shooting in low-light scenes, the large aperture can provide a greater amount of light, and can achieve a higher shutter speed without increasing the ISO sensitivity, and obtain clear and stable imaging.
Focus speed test
As a telephoto lens, the focus speed will naturally receive a lot of attention, compared to the EF mount The ring-shaped USM ultrasonic motor used in the lens, Canon RF70-200mmF2.8LISUSM lens adopts a floating focusing mechanism driven by dual NANOUSM ultrasonic motors. This is Canon’s first lens with an electronic floating focusing mechanism, which is independent of two NANOUSM ultrasonic motors. Drive 2 groups of lenses to focus. We also specially compared the Canon EF70-200mmf/2.8LISIIUSM lens with the Canon EOS5DMarkIII body with the traditional ring-shaped USM ultrasonic motor.
70mm end unlimited Focusing speed from far to the same distance
70mm end subject A to subject B focusing speed
200mm infinity to the same distance focusing speed
200mm subject A to subject B focusing speed
This test tested two lenses separately The distance between the 70mm end and the 200mm end at infinity to the same specific focusing speed and the focusing speed from subject A to subject B is about 80cm. The start of the audio is the sound when the shutter is pressed, and the end of the audio is the beep sound made when the camera body confirms that the focus is achieved. It can be noticed from the waveform diagram that the RF70-200mmF2.8LISUSM lens has better performance than EF70-200mmf/2.8LISIIUSM in both focal lengths in terms of focusing speed, and the two lenses can also be clearly felt during the actual test. The obvious difference in focusing speed. Canon’s SLR lens on the EF mount has been able to provide an excellent focusing experience, while the RF70-200mmF2.8LISUSM equipped with dual NANOUSM ultrasonic motors and floating focus system performed even better.
telephoto lens has very good characteristics in sports shooting, we also use Canon EOSR body to shoot in ski resorts A set of samples were taken, which were shot in RAW+JPEG format without any post-processing.
Focal length: 200mm Aperture: f/2.8 ISO sensitivity: 800 Exposure time: 1/1000s Exposure compensation: 1.7EV White balance: Auto
Focal length: 119mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/640s Exposure compensation: 1.3EV White balance: Auto
Focal length: 200mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/640s Exposure compensation: 1.3EV White balance: Auto
Focal length: 200mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/320s Exposure compensation: 1.3EV White balance: Auto
Focal length: 200mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/2500s Exposure compensation: 0.7EV White balance: Auto
focal length: 200mm aperture: f/2.8 ISO sensitivity: 100 exposure time: 1/1250s exposure compensation: 0.7EV white balance: automatic
Focal length: 200mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/2500s Exposure compensation: 0EV White balance: Auto
Through the sports samples, we can see that this lens has an excellent blur effect at f2.8 aperture. The details are also very expressive, and the raised snowflakes can be clearly captured
More samples: Architecture
The following is the use Samples of ancient buildings taken with Canon RF70-200mmf/2.8LISUSM lens, some of which have undergone minor post-processing.
Focal length: 163mm Aperture: f/2.8 ISO sensitivity: 125 Exposure time: 1/200s Exposure compensation: 0EV White balance: Auto
Focal length: 70mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/100s Exposure compensation: 0EV White balance: Auto
Focal length: 81mm aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/125s Exposure compensation: 0EV White balance: Auto
Focal length: 111mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/1600s Exposure compensation: 0EV White balance: Auto
Focal length: 111mm Aperture: f/ 2.8 ISO sensitivity: 125 Exposure time: 1/500s Exposure compensation: 0EV White balance: Auto
Focal length: 70mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/250s Exposure compensation: 0EV White balance: Auto
Focal length: 200mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/200s Exposure compensation: 0EV White balance: automatic
Focal length: 172mm Aperture: f/2.8 ISO sensitivity: 100 Exposure time: 1/1600s Exposure compensation: 0EV White balance: Auto
focal length: 177mm aperture: f/2.8 ISO sensitivity: 100 exposure time: 1/1250s exposure compensation: 0EV white balance : Automatic
Whether in sports, ecology or still life shooting, this lens has an excellent blur effect, and it also has a stable and excellent picture at various focal lengths. With high quality performance, you can safely use a large aperture for shooting. The large aperture of f/2.8 can bring excellent blur effects, and it can also increase the convenience of shooting in dark light and other scenes. It also has better picture quality performance after the aperture is reduced by one or two stops. Adapt to different shooting scenes.
Editor’s point of view
As the first large aperture telephoto lens with RF mount, Canon RF70 The performance of the -200mmF2.8LISUSM lens is obviously quite good. The white painting makes it highly consistent with the appearance of the L-class telephoto lens of the EF mount. It has a strong family inheritance and the overall appearance is more simple. In terms of optical performance, this lens uses a number of special lenses, which can be said to inherit the excellent optical characteristics of the EF mount lens. It is not difficult to see this from the previous test items. In addition, the addition of SWC coating also adds a lot to the back-light shooting performance of this lens. In addition, the full focal length f/2.8 aperture, 0.7m closest focusing distance, waterproof drop design and fluorine coating also improve the overall quality of this lens. . Compared with the 70-200mmf/2.8 lens of the EF mount, the RF70-200mmF2.8LISUSM has a better performance in terms of size and weight. Although this lens uses an external zoom design, Canon has also addressed this point. Special protection design and external zoom are also a major factor in the reduction of the lens volume. At present, the price of this lens in Canon’s official store is 17,799 yuan, and the price is still a bit high. After the price is loosened, this lens can provide a higher cost performance, but the Canon RF70-200mmF2.8LISUSM lens is obviously long in the large aperture. The focal lens turned in a good answer sheet.
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