[Bestbuy618 Digital Channel]Previously, we reviewed the wide angle zoom lens RF15-35mm F2.8 L IS USM in Canon RF mount big three, and the outstanding optical quality, excellent handling performance, and lightweight lens design are impressive, and the standard zoom lens RF24-70mm F2.8 L IS USM released at the same time with it has finally been released. As the most widely used focal length in the big three, RF24-70mm F2.8 L IS USM is receiving as much attention as the release of a new camera. So, without further ado, today we will review this popular Canon RF mount lens.
Appearance In terms of design, the RF24-70mm F2.8 L IS USM is similar to the RF15-35mm F2.8 L IS USM. It has a black frosted finish and a body length of about 125.7mm weighing about 900g. The filter diameter is 82mm, the size is the same as the SLR big three standard change, for Canon old users to save
The lens has three control rings: the front is the control ring, where you can customize the aperture, shutter, ISO, and other functions; the middle is the focus ring, where you can focus on the subject quickly, smoothly, and quietly; and the tail is the zoom ring, where you can zoom with moderate damping and feel comfortable. On the side of the lens is the focus mode slider, IS image stabilizer switch, and another layer with a lens lock switch.
The RF24-70mm F2.8 L IS USM uses a 15-group, 21-blade optical design, including three GMo (glass molded) aspherical lenses and three UD lenses, with RF’s large bayonet aperture and short back focus distance advantage, can maintain high image quality from the center to the edge of the image? At the 24mm focal length, the center and edge image quality can be said to be quite excellent, and the imaging level at full aperture is maintained at a Only the maximum aperture F2.8 and the smallest aperture F22 show a slight loss of sharpness at the edge, but it is almost negligible in the overall picture. In the 70mm focal length, the center of the image is still impeccable, and the maximum aperture of F2.8 at the edge of the image is slightly degraded, but the aperture is immediately improved after closing one stop. Overall, the imaging performance of the RF24-70mm F2.8 L IS USM is excellent, in line with the Canon lens standard benchmark L red circle high quality standards. Chromatic Dispersion Test When shooting objects with high contrast (especially metal objects) at full aperture, the edges of the subject are prone to purple and green edges.
As previously stated, the RF24-70mm F2.8 L IS USM is equipped with three UD lenses, and Canon’s UD (Ultra Low Dispersion) lenses can effectively compensate for chromatic aberration. Let’s look at the actual shooting results. When we magnified the image taken at the 24mm focal length by 100 percent, there was no chromatic aberration visible, either in-focus or out-of-focus.
Then, under the same shooting conditions, we shot at 70mm.
Only a slight dispersion can be seen in the transition from the focus plane to out-of-focus when the focal length is increased to 70mm. Again, this has no effect on the overall picture viewing experience. Canon’s ASC coating technology is used in the RF24-70mm F2.8 L IS USM, which effectively suppresses glare and ghosting in the image. We used a relatively extreme approach in the test to shoot 24mm focal length and 70mm focal length Even in direct light, the RF24-70mm F2.8 L IS USM shot at full aperture at 24mm and 70mm focal lengths without flare.
In terms of ghosting suppression, the new lens performs admirably, and ghosting is practically non-existent at large apertures. It is worth noting that, due to the use of a 9 aperture piece, the new lens appeared in the 18-beam starburst effect as a small aperture.
Bokeh (out-of-focus) In the resolution test, we saw that the RF24-70mm F2.8 L IS USM has a very high in-focus sharpness, that it can be out of focus like cream, and whether the spot effect is satisfactory. From the 24mm focal length, the out-of-focus bokeh at the maximum aperture is very soft, giving the image a dream-like hazy effect that strips the subject from the image and achieves the purpose of highlighting the subject at large apertures. The image’s sense of hierarchy emerges after closing a few stops of aperture, with varying degrees of bokeh in the far, middle, and near fields, and the transition to bokeh is very natural; additionally, the out-of-focus spot performance is also excellent, but whether in the center or at the edges, the spot shape is very round and full, and there is no caliber erosion.
At this time, the new lens’s out-of-focus performance at maximum aperture is still fairly good, and the out-of-focus spot is also very good; the center of the spot at full aperture is rounded and full.
The RF24-70mm F2.8 L IS USM has dark corners all around at maximum aperture, which disappear after closing the aperture by one stop and are negligible. 70mm Like the 24mm focal length, the 70mm focal length has dark corners at maximum aperture, which disappear after closing the aperture by one stop and are negligible. However, when compared to the former, the dark corners under the 70mm focal length appear to be larger, resulting in a darker overall image, which can be adjusted by opening the in-camera correction. It has no effect on normal shooting.
24mm Aberration test, RF24-70mm F2.8 L IS USM There is a slight barrel distortion phenomenon at the 24mm wide angle end of the image.
70mm The aberration control at the 70mm focal length is quite good, with no significant cushion-shaped aberrations observed. Anti-shake test For the first time in a full-frame F2.8 standard zoom lens, the RF24-70mm F2.8 L IS USM is equipped with an image stabilizer. When shooting images at rest, it provides a hand shake compensation effect of about 5 shutter steps. So we used the 70mm focal length for handheld shooting.
We went beyond the 70mm focal length’s safe shutter speed and shot directly from 1/60th of a second. Perhaps the photographer’s hand is relatively steady; there is no significant difference in the first stop of the test, anti-shake on and off, and the text in the image is very clear.
The gap between the two sides gradually appeared after the second gear, and the image with anti-shake turned on at 1/4 second also showed a slight shaking blur. As a result, the test results roughly correspond to the official label of about 5 levels of shutter speed.
In terms of focusing, the RF24-70mm F2.8 L IS USM employs the NANO USM ultrasonic motor and is paired with the EOS R body’s full-pixel dual-core CMOS AF, enabling high-speed, accurate focusing. Focusing speed test As you can see from the test, the overall focusing speed is very fast, allowing switching between far, medium, and near focus targets in the shortest possible time, with no lag. Its wide-angle end has a closest focusing distance of about 0.21 meters, which allows for better highlighting of details when shooting close up, such as small objects.
Examples of photographs The portable size, high resolution, fast focusing speed, and creamy bokeh effect allow it to shoot scenery, street sweeping, portraits, food, night scenes, and other subjects, which impresses people with Canon’s high optical achievement. If you own a Canon EOS R series camera and only want to take one lens with you when you go out to shoot, the RF24-70mm F2.8 L IS USM is an excellent choice.