Canon RF10-20mm F4 L IS STM evaluation: lightweight ultra wide angle zoom lens

SLR camera In the era, Canon EF 11-24mm f/4L USM lens is very popular. In the era of micro single camera, all three super ternary lenses of Canon RF system have arrived. They are: RF10-20mm F4 L IS STM ultra wide angle in this evaluation, RF24-105mm F2.8 L IS USM Z newly released recently, and RF100-500mm F4.5-7.1 L IS USM ultra telephoto zoom lens. Canon RF10-20mm F4 LIS STM expands the focal length of the wide-angle end to 10mm, bringing a more shocking picture sense. It is also the widest ultra wide-angle zoom lens under Canon. At present, the "small ternary" lenses of Canon RF system are RF14-35mm F4 L IS USM, RF24-105mm F4 L IS USM, and RF70-200mm F4 L IS USM. After the addition of RF10-20mm F4 L IS STM, the focus section coverage of F4 series lenses is increased to 10mm ultra wide angle end to 200mm far focus end.

Canon RF10-20mm F4 L IS STM lens weighs about 570g, and the weight with EOS R5 camera is about 1308g, with lightweight design. Compared with Canon EF 11-24mm f/4L USM with EOS 5D Mark IV With a total weight of about 2070g, the weight loss is more than one third, so we can save more effort when we carry it out for daily use, and it can also be easier to shoot with a stabilizer or UAV.

Canon RF10-20mm F4 LIS STM lens has a variety of special lenses, which can correct the aberrations that are easy to appear in ultra wide-angle lenses. The center and edge have high image quality performance. At the same time, the lens has an optical anti shake effect of up to 5 levels of compensation effect, and a cooperative anti shake effect of up to 6 levels of compensation effect, which can easily achieve dark light handheld shooting.

In terms of focusing, Canon RF10-20mm F4 LIS STM lens is a combination of Canon's first STM motor and position detection sensor. In the past, the RF system L lens was designed with USM motor. STM motor is small in size drive Fast, which can not only reduce the size and weight of the lens, but also shorten the movement of the focusing lens. In addition, the position detection sensor can enable the lens to continue shooting at the focusing position in the off state when starting up, without returning to the initial position, so the starting time can be greatly shortened. That is to say, Canon RF10-20mm F4 LIS STM lens was fully considered by users at the beginning of design, so that users will not miss wonderful moments because of the startup time.

Canon RF10-20mm F4 LIS STM lens is currently sold at an official price of 17699 yuan. Due to the characteristics of super wide angle and high image quality, the lens is suitable for photography of scenery, architecture, stars and other subjects. At the same time, the lens is also suitable for handheld Vlog shooting with stabilizers or aerial video shooting with UAVs. Next, we will officially start the evaluation and introduction of Canon RF10-20mm F4 LIS STM lens.

Canon RF10-20mm F4 L IS STM core parameters:

Lens focal length: 10-20mm

Lens structure: 12 groups of 16 pieces

Aperture blade: 9 pieces (circular aperture)

Minimum aperture: F22

Nearest focusing distance: about 0.25 m

Maximum magnification: about 0.12 times (at 20mm focal length)

Drive system: guide screw type STM stepping motor

Hand jitter compensation effect (based on CIPA test standard): Level 5 (20mm focal length end, when EOS R is used, pitch axis and swing axis directions)

Filter diameter: rear inserted

Maximum diameter and length: about Φ 83.7 × 112 mm

Weight: about 570g

Appearance: lightweight design, multiple customization functions

The appearance of Canon RF10-20mm F4 LIS STM lens is very consistent with that of RF system lens. The main color of black, significant red circle and high-quality workmanship are all available. Canon RF10-20mm F4 LIS STM is based on the characteristics of the RF system with large bayonet and short flange distance, and has optimized the optical and mechanical structure to achieve a small and lightweight design. The lens length is about 112mm, and the weight is about 570g. It is suitable for long handheld photography, or with a stabilizer and UAV photography.

In addition to the excellent workmanship of the lens itself, Canon RF10-20mm F4 L IS STM has a waterproof and dust-proof structure. The operating ring and the movable part of the light at the switch have a dust-proof and waterproof design, which improves the reliability and durability of the lens in different environments.

Canon RF10-20mm F4 LIS STM lens still has RF lens control ring design, and users can customize the settings for shutter, ISO, exposure compensation and other functions. When the control ring rotates, it has a sense of positioning and operation action sound, which is convenient for users to master the operation amount. In addition, the control ring and focus ring of the lens are designed electronically, and the rotation direction can be customized. The sensitivity of the focus ring can be changed with the rotation speed or linked with the rotation angle. The lens also has a new lens function button, which is only available for telephoto lens in the past. By default, it is used to stop auto focusing, which is convenient for servo focusing operation. Users can assign other functions such as depth of field preview to them according to their own needs.

In front lens group, Canon RF10-20mm F4 LIS STM adopts the newly developed large aperture, large curvature Gmo (glass mold casting) double-sided aspherical lens design, which can capture light efficiently and widely, providing strong support for the lens to achieve 10mm focal length and the small and lightweight design of the mirror body. The lens surface is coated with antifouling fluoride film, which provides protection for the lens and makes shooting more reassuring.

Canon RF10-20mm F4 LIS STM lens adopts the rear plug-in filter design. Users can cut the corresponding gelatin filter according to the size and insert it to obtain the desired color rendering effect. Similarly, the plug-in ND neutral density filter can be selected to adjust the exposure.

Image quality: the overall image quality is excellent, and the 10mm end image is shocking

Canon RF10-20mm F4 LIS STM lens adopts 12 sets of 16 pieces of optical structure design, including 1 UD aspherical lens, 2 UD lenses, 2 aspherical lenses, and 1 super UD lens. A variety of special lens designs can effectively compensate for a variety of aberrations that are easy to appear in ultra wide-angle lenses, and obtain a bright imaging effect with less color halos. The optical anti shake unit of the lens is arranged at the rear side of the lens, close to the imaging surface, which can better compensate for the shake around the picture in wide angle and improve the surrounding image quality. Next, let's take a look at the actual picture quality performance of Canon RF10-20mm F4 LIS STM lens.

Canon EOS R5 /Focal length: 10mm/ISO sensitivity: 100/exposure time: 1/13s/aperture: f/8

Canon EOS R 5/Focus: 10mm/ISO sensitivity: 100/Exposure time: 15s/Aperture: f/16

First, let's see how shocking the image performance can be brought by 10mm. The sample above is the sample shot by Canon RF10-20mm F4 LIS STM lens at the 10mm ultra wide angle end. It can be seen that the overall picture can accommodate a wide range of landscapes and perspectives. For large scene scenery shooting and more comprehensive shooting in narrow space, 10mm can be more comprehensive and rich, so it provides greater convenience for users.

Comparison of live shot with 10mm focal length and 11mm focal length

In addition, many users will compare the Canon RF10-20mm F4 LIS STM lens with the EF 11-24mm f/4L USM of the SLR system. Although there is only a 1mm difference in the value of the wide-angle end, the actual imaging performance has expanded a lot, allowing users to be more comfortable in shooting and using.

Canon EOS R5/focal length: 20mm/ISO sensitivity: 400/exposure time: 1/100s/aperture: f/4

Because Canon RF10-20mm F4 LIS STM lens adopts the design of 9 aperture blades and has a constant F4 maximum aperture design, although the lens is very wide, it can still bring a soft out of focus shot effect.

One of the advantages of this lens is that the edge image quality is extremely excellent! Both 10mm and 20mm lenses have excellent center resolution, and even if F4 aperture is fully open, the lens also has sharp edge imaging. If it is used for scenery photography, we can use F4 to shoot in low light without worrying about the decline of edge imaging.

Focus: STM motor+position detection sensor combination

The L-level lens of Canon RF system is usually designed with USM motor, while Canon RF10-20mm F4 LIS STM uses STM stepping motor. On the one hand, the STM stepping motor is small in size, so it occupies less space, which can further reduce the size and weight of the lens; On the other hand, the focusing speed of the STM stepping motor is not lower than that of the USM ultrasonic motor. At the same time, it has quiet and smooth focusing characteristics, so the lens itself is more suitable for video capture.

Lens focusing speed test

Another innovation is that Canon RF10-20mm F4 LIS STM is Canon's first lens product that uses the combination of STM motor design and position detection sensor. With the position detection sensor, the most intuitive experience for users is that the boot speed is greatly reduced, because the focusing lens does not need to return to the original position. Users can enter the shooting state more quickly after starting up, which is convenient for recording fleeting moments. For star photography, there is no need to refocus after replacing the battery.

Focus position remains unchanged after shutdown

In addition, the nearest focusing distance of Canon RF10-20mm F4 LIS STM is about 0.25m. In addition to shooting shocking pictures at a close distance, this focusing distance is very suitable for the popular focusing needs of shooting alpine flowers.

Anti shake: Level 5 optical anti shake, Level 6 cooperative anti shake

In our daily shooting, the wider the focal section is, the less likely it is to shake. However, Canon RF10-20mm F4 LIS STM is still designed with an optical anti shake capability of up to 5 levels of compensation effect. If it works with Canon EOS R series cameras that support body anti shake, it can achieve up to 6 levels of compensation effect.

Canon EOS R5/focal length: 20mm/ISO sensitivity: 400/aperture: f/8/exposure time: 2s handheld shooting

100% screenshots of the picture can still ensure clear details

After testing, with the EOS R5 body, this lens can achieve a 2s handheld stable shooting at the 20mm end, and the picture can still remain clear without jitter. When shooting in 2s, the shooting success rate is almost guaranteed to be close to 100%.

In addition, Canon RF10-20mm F4 LIS STM lens is the first product to introduce peripheral coordination control into the RF system lens. What does it mean? That is to say, the wide-angle lens is subject to perspective deformation. Even if the central image is stable and clear, the peripheral image is prone to shake. Canon RF10-20mm F4 LIS STM's optical anti shake algorithm has been upgraded, and the anti shake unit has been targeted at the rear of the lens near the camera imaging surface. In this way, when used with models that support body anti shake, it can more effectively compensate for the peripheral jitter of the image that is difficult to compensate before. Next, let's take a look at the anti shake effect of the lens in the actual experience.

Edge area screenshot comparison

Edge area screenshot comparison

Anti shake not only works when we hold photos, but also plays a very important role when we hold videos. Through our handheld video capture test, we can see that Canon RF10-20mm F4 LIS STM's video capture anti shake effect is also excellent. Under the effect of cooperative anti shake, the newly added peripheral coordination control also has an effect on video capture, which can further compensate for the slight peripheral jitter. If digital anti shake is enabled at the same time, better overall shake compensation effect can be obtained.

Video anti shake stability test

Dispersion: Almost invisible

Because Canon RF10-20mm F4 LIS STM lens adopts a variety of special lens designs and special coating design, it also has outstanding performance in suppressing dispersion. Next, let's see how Canon RF10-20mm F4 LIS STM performs in terms of dispersion.

The dispersion control of this lens is very ideal. Under normal shooting conditions, no matter 10mm or 20mm, when the aperture is fully open, there is almost no obvious highlight edge dispersion.

Glare: first-class overall performance

Canon RF10-20mm F4 LIS STM lens adopts SWC sub wavelength structure coating (2 sides) and ASC coating (2 sides), which effectively suppresses glare and ghost that are easy to appear in wide-angle lens. Next, let's look at the actual glare performance of the lens.

Although this lens is a bulb head, it has only slight glare and ghost under various extreme conditions with excellent coating, and its overall anti glare performance is absolutely first-class.

Dark angle: normal ultra wide angle lens level

Next, let's see how the dark angle control of Canon RF10-20mm F4 LIS STM lens works.

The image field of this lens at the 10mm end is not enough to cover the whole frame area, so when we do not open the correction, we can see that there are black corners on the four corners of the picture. However, JPG format for fuselage shooting will enable correction by default, so the dark angle is very slight. The dark angle control of the 20mm end lens is ideal, and there will be no obvious dark angle without correction.

Distortion: ideal distortion control

Finally, let's take a look at the distortion control of Canon RF10-20mm F4 LIS STM lens.

In terms of distortion control, this lens also has large deformation at the 10mm wide-angle end, which needs to rely on optical correction. But when we load the correction or shoot the JPG format directly from the fuselage, we can't see any deformation. The distortion control of the 20mm end lens is ideal, without correction, but also has ideal distortion control.

Conclusion: A wider super wide angle shooting artifact

So far, our evaluation and introduction of Canon RF10-20mm F4 LIS STM lens has come to an end. The first impression of Canon RF10-20mm F4 L IS STM lens is that it is small and light. As a member of the F4 constant aperture lens of the RF system, it is almost the same size and weight as other lens products. Therefore, it not only has the advantages of lightweight and volume, but also has sufficient convenience for use and storage. Because of this, we can not only more easily complete hand-held shooting, but also more easily complete other types of shooting tasks with camera stabilizers and UAVs.

As Canon's red circle lens, RF system's L-level lens, Canon RF10-20mm F4 LIS STM's image quality and optical quality don't need to be said much. Through our test, we can quickly and completely understand. Canon RF10-20mm F4 LIS STM lens itself is a masterpiece of high image quality and high quality, especially the image quality around the screen is excellent. The lens itself is designed with a 10mm ultra wide angle end, which is the widest wide-angle zoom lens under Canon at present, bringing shooting experience from different perspectives and more shooting convenience. At the same time, F4 constant aperture and the nearest focusing distance of 0.25m can also help users to bring a certain illusion effect and beautiful spot effect.

In terms of focusing, the design of the STM stepping motor can enable Canon RF10-20mm F4 LIS STM to have a fast and accurate focusing experience while achieving a quieter focusing process. Therefore, the lens is not only suitable for photography, but also very suitable for video capture. In addition to the special design of STM motor, Canon has also carefully added a position detection sensor, which can significantly reduce the boot time of the lens and quickly enter the shooting state, making it easier for us to deal with sudden shooting.

Canon EOS R5/focal length: 10mm/ISO sensitivity: 100/exposure time: 1/40s/aperture: f/16

Although it is an ultra wide-angle lens, Canon still brings excellent anti shake effect to RF10-20mm F4 LIS STM. In actual shooting, this anti shake effect can help users better complete handheld shooting, whether in photography or video. In particular, the peripheral coordination control function has a very obvious effect on the jitter compensation of peripheral images, which can enable users to obtain more stable handheld photos and videos.

In general, Canon RF10-20mm F4 LIS STM lens makes the focus section coverage of the RF system F4 aperture lens more comprehensive. The lens itself can meet the shooting needs of users in the fields of scenery, architecture, stars and other fields by virtue of its super wide angle, high image quality and high mobility. At the same time, it is more suitable for users to use stabilizers to shoot Vlogs in hand, or to use UAVs for aerial photography.

Canon RF10-20mm F4 L IS STM lens More samples:

Canon EOS R5/focal length: 20mm/ISO sensitivity: 100/exposure time: 1/3200s/aperture: f/4

Canon EOS R5/focal length: 20mm/ISO sensitivity: 100/exposure time: 1/20s/aperture: f/8

Canon EOS R5/focal length: 10mm/ISO sensitivity: 100/exposure time: 1/15s/aperture: f/8

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