Bringing more extreme images Analysis of the advantages of Canon’s RF mount system
On September 5, 2018, Canon not only released its first full-frame mirrorless camera EOS R, but also brought a new RF mount and lens system to everyone. Compared with the EF mount and lens system of the SLR system, what are the characteristics and advantages of the RF system? In the future, how will this system move in the opposite direction? Today we will take a look.
caliber and short flange distance bring better picture quality and Smaller size
The inner diameter of the RF mount is 54mm, the same as the EF mount. Generally speaking, the larger the bayonet, the larger the aperture diameter can be accommodated. Although the size of the RF mount and the EF mount are the same, the more novel design gives the optical design more flexibility and freedom, allowing the RF series lens to use a larger maximum aperture.
short flange Distance brings higher picture quality and compact size
The flange distance of EOS R and EOS RP cameras is 20 mm, which is much shorter than that of SLR cameras. Those who are familiar with photography principles know that the shorter the flange distance, the closer the last lens can be to the graphic sensor. As a result, the body becomes more compact and the lens design is more flexible.
after large caliber Mirror group
左The side RF70-200mm F2.8 L IS USM lens is more compact than the EF lens of the same specification.
Thanks to the large-diameter bayonet and short rear focus distance common to RF mounts, the flexibility of lens optical design is improved. Large-diameter lenses can be arranged near the imaging surface, which can reduce light refraction, While reducing aberrations, it produces a lens with excellent center and edge imaging and a smaller volume. Many large-aperture “bull heads” have a compact size, which complements the equally compact R series cameras.
New bayonet communication system brings more possibilities
RF lens has 12 electrical contacts, more than 8 of EF lens. This makes the data transmission between the body and the lens faster and faster, and can achieve many functions that the EF mount system cannot achieve.
RF bayonet The 12 electronic contacts of are equipped with a multifunctional control ring on the RF lens. The user can freely set the system settings and shooting parameters that the control ring can adjust. This is what the new bayonet communication system brings benefit.
Multi-function control The ring makes the control more efficient
After combining the camera and lens, the camera can identify which lens it is, and give the optimal optical configuration scheme through presets, which can correct distortion, dispersion, vignetting, etc. Relevant information has been optimized to achieve the best quality output. The new bayonet system allows the body and the lens to not simply receive light, drive focus, and record parameters, but more complex data communication. The two cooperate to bring users the best image performance.
Double anti-shake System
In addition, judging from the current industry development, lens anti-shake + body anti-shake will be the future trend, and this also depends on a large amount of high-speed data exchange between the body and the lens . The built-in gyroscope of the RF lens can detect the amount of shake through the image information of the lens’s gyroscope sensor and the camera CMOS image sensor, compare and analyze the information, and detect the low-frequency shake such as the slow shaking of the subject with high precision. make up. The hand-shake compensation effect during movie shooting has also been enhanced. Through the communication of the new bayonet, the electronic IS of the camera and the IS image stabilizer of the lens are coordinated and controlled to realize the powerful hand-shake compensation effect of the combined IS.
The RF camp is gradually growing
There are currently 11 types of RF lenses, including 7 zoom lenses and 4 fixed focus lenses. Among the zoom lenses, there are large ternary lenses that photographers like to use, travel lenses such as RF24-240mm F4-6.3 IS USM, and cost-effective products such as RF24-105mm F4-7.1 IS STM. The RF28-70mm F2 L USM is a top zoom lens that highlights the strength of the RF system.
RF28-70mm F2 L USM lens
In terms of fixed-focus lenses, the top-level large-aperture portrait lenses such as RF50mm F1.2 L USM and RF85mm F1.2L USM are naturally indispensable, and there are also RF35mm F1.8 MACRO IS STM which are cheap A lot of gold oil products. At the same time, Canon also launched an RF85mm F1.2 L USM DS lens with smooth defocus coating technology. This lens has a softer and smoother out-of-focus blur technology, which provides better performance for portraits, weddings and other photography. force. ,
RF35mm F1 .8 MACRO IS STM lens
Although the number of lenses in the current RF system is quite large, it can meet most of the needs of photographers. But compared to the EF system, it is still not very rich. Of course, we don’t need to worry about this, just leave it to time to solve it. The inherent advantages of the RF bayonet, Gauge-specific lenses and products more suitable for shooting videos are also the future development direction of RF systems.
The professionalization of the micro-single is not only about the body performance, but also the lens It is an important part. The RF lens group really allows us to see the visible future of Canon’s full-frame mirrorless system. With the fiercer competition of mirrorless systems, lens groups are becoming more and more important when users choose systems.
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