Features:
The RF70-200mm F2.8 L IS USM has achieved significant miniaturization. Compared with the EF 70-200mm f / 2.8 L IS III USM, its length and weight have been significantly reduced by 27% and 28%, respectively, further improving portability. And manoeuvrability, and the first application of a dual Nano USM focus motor in Canon lenses, achieving quiet, high-speed focusing performance.
Describtion:
The large mount diameter and short rear focus distance of the EOS R system make the lens design more possible, which is fully reflected on the Canon RF70-200mm F2.8 L IS USM. This lens has a compact design that is difficult to achieve with an EF mount lens of the same specifications. Compared with the EF 70-200mm f / 2.8 L IS III USM, the lens has a substantial reduction in length and weight of about 27% and 28%, which is not only convenient for photography. In the bag, it also significantly reduces the user's burden when carrying and shooting for a long time. Most of the weight of this lens is located on the side of the camera body, and the center of gravity is closer to the photographer. Even at the telephoto end of the extended lens barrel, it can maintain a good holding balance. In addition, its compact structure can reduce the pressure on the surrounding environment and the subject.
Canon's RF70-200mm F2.8 L IS USM has a focal length of 70mm to 200mm, which can take into account various subjects such as sports, ecological photography, portraits, and scenery. At the same time, the F2.8 constant maximum aperture in all focal lengths and the 9-blade circular aperture structure can also obtain beautiful and smooth blurring effects, and at the same time, can achieve higher shutter speeds, especially in dark light environments. Further improve the shooting success rate.
As a new generation of Canon equipped with F2.8 constant maximum aperture lens, the Canon RF70-200mm F2.8 L IS USM lens benefits from the advantages of the large aperture and short back focus distance of the EOS R system, and has been applied by a variety of Canon Advanced optical technology, so that the picture quality from the center to the edge of the picture once again improved in the entire zoom range. The lens uses 17 optical structures in 13 groups. With the use of a glass mold aspheric lens and a UD (ultra-low dispersion) aspherical lens, spherical aberration correction and zoom lens miniaturization are achieved. The highly efficient arrangement of 3 UD lenses and 1 super UD lens significantly corrects chromatic aberrations and reduces halo from the center to the edge of the screen to achieve high image quality. In addition, this lens also applies Canon SWC sub-wavelength structure coating. The SWC coating has excellent anti-reflection properties, especially for light with a large incident angle, which can reduce the possibility of glare and ghosting at the edges of lenses with large curvature.
Another breakthrough for the Canon RF70-200mm F2.8 L IS USM lens is to become Canon's first lens with a dual Nano USM focus motor. The lens drives the floating lens group and the focusing lens through two Nano USM focusing motors to achieve electronic floating focus control. It achieves quiet, energy-saving and high-speed operation without sacrificing compact appearance, while effectively suppressing the breathing effect of focusing. , When shooting a movie, you can get a more stable composition when performing a focus shift operation. In addition, the application of electronic floating focus control also significantly shortened the closest focusing distance. The closest focusing distance of the RF70-200mm F2.8 L IS USM in all focal lengths is only about 0.7m, and the magnification is about 0.11X and 0.23X at the 70mm and 200mm ends, respectively. It can obtain more powerful and prominent close-up photography Expressiveness.
When taking still photos, the RF70-200mm F2.8 L IS USM lens cooperates with EOS R or EOS RP cameras to achieve dual detection IS. While the lens IS function works, it can also pass the image information of the camera's CMOS image sensor. Detects the amount of jitter. By comparing and analyzing these two types of information, it is possible to accurately detect and correct low-frequency shakes that are difficult to detect by the lens alone (slow body shake caused by breathing, etc.), thereby achieving a maximum equivalent to about 5 steps of 2 shutter speeds Hand shake compensation effect. When you are creating a movie, you can also use the camera's image information to detect the amount of blur without correction of the IS function of the lens. At the same time, through the more powerful communication capability of the RF bayonet, you can use the camera ’s five-axis digital IS and IS The function of the RF lens is controlled cooperatively, and the combined IS function is realized to obtain a more powerful image stabilization effect.
