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Epoch-making Super wide Angle Ternary Canon RF15-35/2.8L ISreview.

Canon RF15-35mm F2.8 L IS USM lens overall design is very similar to RF24-70mm F2.8 L IS USM, continuing the simple design and lightweight volume, without increasing the size of the premise, the addition of IS image stabilizer. When used with EOS R, it weighs only about 1500 grams, and this improvement is palpable. It can effectively reduce the burden of users carrying and shooting for a long time, and provide a better carrying and shooting experience.

Similarly, there is no top-heavy imbalance in the use of the Canon RF15-35mm F2.8 L IS USM lens. There are only Canon and 15Mel 35 on the mirror, which is highly recognizable.

The zoom ring of the lens uses a wide rubber ring, which has a good sense of handle and damping. It also marks the focal length scale of 15, 20, 24, 28 and 35mm, which can achieve the virtual effect of the wide-angle fixed-focus lens. The wide viewing angle of about 110 °30 “can accommodate more pictures, further emphasize the sense of perspective, and create a magnificent feeling. In the 35mm section, it can provide a natural perspective with less deformation, as well as moderate perspective, which can be used in street photography, portraits and other shooting themes.

As a major feature of the RF bayonet lens, the Canon RF15-35mm F2.8 L IS USM lens certainly has a custom control ring, which can assign the original adjustment of the aperture, shutter speed, ISO sensitivity and exposure compensation to the lens control ring, with the front and rear dial wheel to facilitate blind operation when using the electronic viewfinder, greatly improving the convenience of operation. At the same time, the focus ring is also designed electronically, and the rotation direction, rotation speed or linkage with the rotation amount of the focus ring can be customized to meet the usage habits of different people. A large number of custom features have opened a new chapter in the convenience and operation of Canon’s imaging system.

The Canon RF15-35mm F2.8 L IS USM lens also uses a NANO USM ultrasonic motor with a recent focus distance of about 0.28m. Combined with the full-pixel dual-core CMOS AF technology on the EOS R series, the Canon F2.8 lens provides a quiet, high-speed, high-precision focus experience and smooth autofocus when shooting video.

Equipped with IS image stabilizer, improve the control algorithm of IS image stabilizer, under the double detection IS function, the hand jitter compensation effect of still image shooting is enhanced to a maximum equivalent to about 5 levels of hand jitter compensation, while maintaining high picture quality and compact portability. When used with EOS R, the weight is only about 1500 grams.

In terms of optical quality, the lens adopts 12 groups of 16 optical designs, including 3 GMo (glass molded) aspheric lenses and 2 UD ultra-low dispersion lenses, which can suppress chromatic aberration, spherical aberration and distortion aberration, etc., and adopt SWC subwavelength structure coating and ASC coating with good anti-reflection effect, which can improve the transmittance of the lens, effectively reduce glare and ghosts, and can also produce a clear and transparent effect in the backlight scene. Using 9 round aperture blades, the virtual effect is natural and soft.

The attached sunshade uses a threaded anti-reflection design to reduce the secondary refraction of light, and the photos taken are still very clear for scenes such as large backlighting. The lens adopts dustproof and waterproof structure and implements antifouling fluorine coating, which is reliable and can cope with the harsh shooting environment. It is suitable for a wide range of fields, such as scenery, architecture, street shooting and so on. Aspheric front lens group, you can install a conventional 82mm filter.

The once brilliant “Big Sanyuan” series has been renovated in RF bayonet lenses, the focal length coverage has been extended to 15mm ultra-wide angle, and all three lenses are equipped with IS image stabilizers, expanding the adaptability and image expression of different environmental scenes. It further enriches the product line of RF lenses and provides more practical and easy-to-use lens combination solutions for professional users and photography enthusiasts.

In this test, Canon EOS R fuselage with RF15-35mm F2.8 L IS USM lens is used, all internal optimization settings are turned off, ISO sensitivity is 100, Av file is used to shoot each aperture, and the center and edge are intercepted for sharpness testing. the results are as follows:

The position of the red box in the above picture is a screenshot of the table below.

The wide-angle edge is the hardest to control, but in the RF15-35mm F2.8 L IS USM lens, I saw a different effect. At the wide-angle 15mm end, the full-open F2.8 aperture has a less distorted sharp image quality, and the overall image quality is the best at F8 until the resolution begins to decay after the F11 aperture, but the image quality from the center to the edge is very good. Let’s take a look at the performance of the 35mm telephoto end.

The position of the red box in the above picture is a screenshot of the table below.

The performance of the 35mm at the telephoto end is still surprising. The sharpness at the full F2.8 aperture is very good, and the best image quality is still at the F8 aperture. After the F11 aperture, the resolution begins to decline, but the overall picture quality is very high. Generally speaking, the newly developed UD ultra-low dispersion lenses and GMo (glass molded) aspheric lenses are very effective in suppressing aberration and secondary spectrum.


Shooting with the lens against the light source can effectively test the level of backlight shooting and whether it can effectively suppress glare ghosts. Here are the test results of Canon RF15-35mm F2.8 L IS USM lens:

As can be seen from the comparison figure in the table above, the anti-glare / ghost ability of the Canon RF15-35mm F2.8 L IS USM lens is quite good, and the backlight shooting is good. This is due to the good anti-reflection effect of SWC sub-wavelength structure coating and ASC coating, which can improve the transmittance of the lens, effectively reduce glare and ghosts, and can get a clear and transparent effect in the backlight scene.

As the Canon RF15-35mm F2.8 L IS USM lens is an ultra-wide-angle lens, there must be a phenomenon that the four corners of the picture turn black, which is the so-called dark angle problem. At the 15mm end, you can see that when the aperture shrinks to F8, the problem of the dark corner is improved a lot. At the 35mm end, the dark angle problem is difficult to detect when the aperture shrinks to F5.6. Let’s take a look at the GIF comparison diagram optimized in the machine.

Dark Angle and distortion of 15mm end.

Dark Angle and distortion of 35mm end.

The dynamic comparison of the GIF diagram above shows that there is a barrel distortion at the wide-angle 15mm end, and the picture can be restored to normal through in-machine optimization, and the dark angle disappears. The telephoto 35mm end has the same result. The screen presents a pillow-shaped distortion, and the optimization in the boot machine can restore the real picture. With the addition of digital technology, the Canon RF15-35mm F2.8 L IS USM lens is by far the best ultra-wide-angle micro single lens.

Who says the wide angle is not virtual? under the advantages of small object distance, large aperture and full frame, the Canon RF15-35mm F2.8 L IS USM lens has a full F2.8 aperture. Recently, the focus distance is about 0.28m, it can still have a beautiful virtual effect.

The objective data above already know that the performance of the Canon RF15-35mm F2.8 L IS USM lens is powerful, so let’s take a look at the sample in the actual shooting.

Have a large aperture is the advantage, indoor and outdoor shooting can be well dealt with, Canon RF15-35mm F2.8 L IS USM lens on the restoration of color naturally not artificial, virtual effect is very gorgeous, like street photography, environmental portraits photographers must not miss this shot. The wide-angle 15mm end can make use of its perspective effect to exaggerate the subject, while the 35mm end uses F2.8 large aperture to achieve the virtual effect of the background.

Overall, the RF15-35mm F2.8 L IS USM lens is currently the best Canon ultra-wide-angle micro single lens. RF bayonet redesigned optical structure, can achieve 15mm ultra-wide angle, while equipped with IS image stabilizer constant F2.8 aperture L wide-angle zoom lens; the use of dustproof and waterproof drip structure, the implementation of anti-fouling fluorine coating, high reliability, can cope with the harsh shooting environment. So far, Canon RF15-35mm F2.8 L IS USM, RF24-70mm F2.8 L IS USM and RF70-200mm F2.8 L IS USM lenses work together to form the new RF “Big three” lens, which can better serve professional photographers.

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