Canon announced the launch of two new RF series lenses, namely the RF large three-dimensional telephoto zoom lens RF70-200mmF2.8LISUSM and the professional portrait lens RF85mmF1.2LUSMDS with smooth defocus
Canon announced the launch of two new RF series lenses, namely the RF large three-dimensional telephoto zoom lens RF70-200mmF2.8LISUSM and the professional portrait lens RF85mmF1.2LUSMDS with smooth defocus. As two Canon L-class lenses with large apertures, the RF70-200mmF2.8LISUSM and RF85mmF1.2LUSMDS take full advantage of the EOSR system’s large mount diameter and short back focus distance to achieve the expected high optical quality. RF70-200mmF2.8LISUSM has been significantly miniaturized. Compared with EF70-200mmf/2.8LISIIIUSM, the length and weight of the lens body are significantly reduced by about 27% and 28%, respectively. This further improves portability and mobility, and is used in Canon lenses. For the first time, dual NanoUSM focusing motors are applied to achieve quiet and high-speed focusing performance. The launch of this lens also signifies that Canon’s 1RF bayonet ternary lens series has been completed. RF85mmF1.2LUSMDS is the first lens in the RF series that supports smooth defocusing, and its soft out-of-focus blur effect makes the works have charming visual expression.
has F2.8 Canon’s RF mount large ternary lens series with constant large aperture has been completed
RF70-200mmF2.8LISUSM, F2.8 telephoto zoom lens achieves many New breakthroughs
The EOSR system’s large mount diameter and short rear focus distance make lens design more possibilities, which is fully reflected in Canon RF70-200mmF2.8LISUSM. The lens has a compact design that is difficult to achieve with the same specifications of the EF mount. Compared with the EF70-200mmf/2.8LISIIIUSM, the length and weight are significantly reduced by about 27% and 28%, respectively. It is not only convenient to put in a camera bag, but also Significantly reduces the user’s burden when carrying and shooting for a long time. Most of the weight of the 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 also reduce the pressure on the surrounding environment and the subject.
Canon RF70-200mmF2.8LISUSM lens sample
The 70mm to 200mm focal length of Canon RF70-200mmF2.8LISUSM can take into account sports themes, ecological photography, portraits, landscapes, etc. Video creation of various themes. At the same time, the F2.8 constant maximum aperture in all focal lengths and the 9-blade circular aperture structure can also obtain a beautiful and smooth large-scale blur effect. At the same time, it can achieve higher shutter speeds, especially in low-light environments. Further improve the shooting success rate.
As a new generation product of Canon equipped with F2.8 constant maximum aperture lens, Canon RF70-200mmF2.8LISUSM lens benefits from the advantages of EOSR system’s large aperture mount and short back focus distance, and through the application of more This is Canon’s advanced optical technology, so that in the entire zoom range, the image quality from the center to the edge of the picture is once again improved. The lens adopts an optical structure of 17 elements in 13 groups. With the help of 1 glass mold aspheric lens and 1 UD aspheric lens, the spherical aberration correction and the miniaturization of the zoom lens are realized. Three UD lenses and one super UD lens are efficiently arranged to greatly correct chromatic aberrations and reduce the color halo from the center to the edges of the screen to achieve high 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.
Canon RF70-200mmF2.8LISUSM lens optical structure drawing
Canon RF70-200mmF2.8LISUSM lens MTF curve graph
Another breakthrough of Canon’s RF70-200mmF2.8LISUSM lens is to become Canon’s first lens with dual NanoUSM focus motors. The lens uses two NanoUSM focus motors to drive the floating lens group and the focus lens separately to achieve electronic floating focus control. Without sacrificing the compact shape, it achieves quiet, energy-saving and high-speed operation, while effectively suppressing the breathing effect of focusing. When shooting movies, you can achieve a more stable composition when performing focus shift operations. In addition, the application of electronic floating focus control has significantly shortened the closest focusing distance. The shortest focusing distance of RF70-200mmF2.8LISUSM in all focal lengths is only about 0.7m, and the magnification is about 0.11X and 0.23X at 70mm end and 200mm end respectively, which can obtain more powerful and prominent close-up photography performance.
When shooting still photos, the RF70-200mmF2.8LISUSM lens cooperates with EOSR or EOSRP cameras to achieve dual detection IS. While the lens IS function is working, it can also pass the image information of the camera’s CMOS image sensor Detect the amount of jitter. By comparing and analyzing these two types of information, it is possible to accurately detect and correct low-frequency jitter that is difficult to detect by the lens alone, so as to achieve a hand-shake compensation effect equivalent to a maximum of about 5 levels and 2 shutter speeds. When creating a short film, the camera’s image information can also be used to detect the uncorrected amount of blurring by the IS function of the lens. At the same time, the more powerful communication capabilities of the RF mount can be used for the five-axis digital IS and IS The functional RF lens performs collaborative control to realize the combined IS function and obtain a more powerful image stabilization effect.
The filter specification used by the RF70-200mmF2.8LISUSM lens is 77mm. The maximum diameter and length of the lens are about 89.9mm and about 146.0mm respectively, and the weight is about 1070g.
RF85mmF1.2LUSMDS, smooth defocus presents a soft out-of-focus blur effect
Out-of-focus blur effect is for shooting portraits The key is, but users have different preferences for the blur shape, and there is no correct answer. Therefore, on the basis of RF85mmF1.2LUSM, Canon has introduced RF85mmF1.2LUSMDS which supports smooth defocusing. This new lens inherits the excellent optical design of RF85mmF1.2LUSM while pursuing a smooth out-of-focus blur effect, bringing new choices for professional photographers who pursue the beauty of out-of-focus blur and photographers who love portrait creation.
Canon RF85mmF1.2LUSMDS lens sample
In order to achieve a soft out-of-focus blur effect, RF85mmF1.2LUSMDS adopts DS coating design. DS coating is Canon’s vapor deposition multilayer coating technology. The transmittance at the center of the structure is high, and the transmittance at the edges is low, so a smooth out-of-focus blur effect can be achieved. At the same time, because the lens adopts a double-sided covering design that applies DS coating to the front and rear surfaces of the lens, the transmittance of the entire edge can be reduced, thereby softly blurring the outline of the entire out-of-focus blur image to make it larger Maximize the effect of DS coating. At the same time, through the use of F1.2 large aperture and DS coating, a significant and smooth out-of-focus blur effect can be obtained even at the edge of the picture, so it is very suitable for soft out-of-focus blur shooting creation on the foreground and background. In addition, the out-of-focus blur smoothing defocus effect brought by DS coating will change with the change of the aperture value. Under F1.2 large aperture, the smooth defocusing effect of DS coating will be more obvious. The light transmittance of the lens at the edge of the DS coating decreases, so the lens brightness is about 1? lower than F1.2 when the aperture is fully opened. level. The camera can achieve proper automatic exposure control by upgrading to a new version of the firmware.
RF85mmF1.2LUSMDS is very suitable for shooting under decorative lighting and other point light sources. It can softly and smoothly blur the outline of the point light source to create a charming out-of-focus blur effect, or stand out against a complex background The shooting of the subject, such as softly blurring the overlapping trees, reduces the complexity of the background and foreground, and makes the subject more prominent.
RF85mmF1.2LUSMDS inherits the excellent optical design of RF85mmF1.2LUSM. In addition to the smooth defocusing effect obtained by DS coating, it also has high resolution, high contrast and chromatic aberration suppression. , Achieving high image quality from the center to the edge of the screen. Based on the inherent advantages of the Canon EOSR system’s large mount diameter and short rear focus distance, the lens can achieve greater improvements in optical quality and design space. The optical structure of the lens is 13 elements in 9 groups. The combination of BR lenses and UD lenses effectively suppresses chromatic aberrations and greatly reduces the color halos that are easily produced by large-aperture lenses. At the same time, a ground aspheric lens is also arranged in front of the aperture, and through the optimization and reasonable configuration of the lens position, the overall high-quality performance from the center to the edge of the picture under the F1.2 large aperture is realized. In addition, the lens also uses ASC coating with good anti-reflection effect, which can increase the transmittance of the lens, effectively suppress the glare and ghost caused by the light source in the picture, reduce the influence of backlight on the imaging, and bring a clear and transparent photo effect.
Canon RF85mmF1.2LUSMDS lens optical structure drawing
Canon RF85mmF1.2LUSMDS lens MTF curve graph
RF85mmF1.2LUSMDS With 9 circular aperture blades design, the closest focusing distance is only about 85cm, and the maximum magnification is 0.12X, so it can achieve closer capture of portraits or still life close-ups, and further enhance shooting flexibility. This lens uses a filter specification of 82mm. The maximum diameter and length of the lens are about 103.2mm and 117.3mm, respectively, and the weight is about 1195g.
More common features
The two lenses are also equipped with the new control ring on the RF lens. Through the control ring, you can Set the control ring to adjust common shooting parameters such as exposure compensation, sensitivity value, aperture value, or shutter speed according to usage requirements. With this design, users can focus their eyes on the viewfinder more intently, without having to divert their eyes to easily and quickly complete the adjustment of the set shooting parameters, which further enhances the shooting experience.
RF70-200mmF2.8LISUSM and RF85mmF1.2LUSMDS lenses both adopt a waterproof, drip-proof and dust-proof structure3 to achieve high reliability in harsh shooting environments. Especially for the RF70-200mmF2.8LISUSM lens, due to the external zoom type, the lens is specially designed with a ventilation route to prevent water vapor inhalation, and special dust-proof materials are used to prevent dust from penetrating. At the same time, the two lenses have also added an anti-fouling fluorine coating with better oil and water repellency, which not only brings good light transmittance, but also makes it easier to wipe off water droplets or oil stains attached to the lens4.
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