August 28, 2019，Canon (China) launches two new RF three-element lenses, RF15-35mm F2.8 L IS USM and RF24-70mm F2.8 L IS USM。With the large bayonet diameter of the EOS R system、Advantage of short back focus distance，and aspherical lenses、Special lenses such as UD lenses and advanced coating technologies such as ASC，Two models have F2.The new bc game casino with 8 constant maximum apertures provides expected high-level optical performance，Equipped with IS image stabilizer and Nano USM drive motor suitable for photo and video shooting and other functional designs。In addition，RF15-35mm F2.8 L IS USM further expands the focal length at the wide-angle end，Realize more creative possibilities。The launch of two new products，Plus the RF70-200mm F2 that will be released within this year.8 L IS USM，will gradually build a film that is highly anticipated by the majority of film lovers and professionals、Has F2.8 Canon RF mount large triple with constant maximum aperture，Further enhancing the lineup of Canon 1RF mount lenses，Attract more users to use the EOS R system to record precious moments。
Canon RF15-35mm F2.8 bc game casino
Canon RF24-70mm F2.8 bc game casino
For the majority of image enthusiasts and professional photographers who use and pay attention to the EOS R system，I have been looking forward to Canon’s launch of the RF mount Big Three。Canon Sanyuan relies on generations of excellent products in the EF bc game casino camp，Having established an unshakable reputation among users over the years，has a large number of users。Today，Using the innate features of the EOS R system such as the large bayonet diameter and short back focus distance，Canon is realizing more design possibilities on the RF mount ternary，Further continuing the legend of Canon Big Three。Within similar or smaller bc game casino sizes，The new bc game casino will be at F2.8 constant maximum aperture，Achieve wider focal length coverage from 15mm to 200mm，The optical performance has also been improved to a higher level，And all provide IS image stabilizer function，At the same time, it continues Dashanyuan’s consistent high reliability and excellent manufacturing technology。
Provides support for IS image stabilizer and Nano bc game casino motor
Taking advantage of the large bayonet diameter and short back focus distance of the EOS R system，RF15-35mm F2.8 L IS USM and RF24-70mm F2.8 L IS USM bc game casino offers greater design flexibility，Therefore, the two lenses also become Canon’s first full-frame F2 equipped with IS image stabilizer.8 maximum aperture wide-angle zoom bc game casino and standard zoom bc game casino。While taking still photos，Both lenses work with EOS R or EOS RP cameras，Double detection IS can be achieved，While the bc game casino IS function is working，The amount of shake can also be detected from the image information of the camera's CMOS image sensor。By comparing and analyzing these two types of information，Can detect and correct low-frequency shake (slow body shake caused by breathing, etc.) that is difficult to detect with the bc game casino alone with high accuracy，This enables hand-shake compensation up to approximately 5 stops and 2 shutter speeds。While creating short films，The amount of blur that is not corrected by the IS function of the bc game casino can also be detected through the image information of the camera，At the same time, more powerful communication capabilities through the RF bayonet，You can collaboratively control the short five-axis digital IS on the camera and the RF bc game casino with IS function，Realize combined IS function，Get more powerful image stabilization。
RF15-35mm F2 with Nano USM drive motor.8 L IS USM and RF24-70mm F2.8 L IS USM bc game casino for use with EOS R series full-pixel dual-core CMOS AF for specialized micro applications，High speed available、High-precision still image autofocus and quiet、Smooth movie autofocus。Both lenses are also equipped with the new control ring on the RF bc game casino，Through the control loop，Can be used according to needs，Specify aperture、Shutter speed、Quick adjustment of ISO sensitivity and exposure compensation parameters，Thus enabling more intuitive and faster shooting while observing the viewfinder。
RF15-35mm F2 at 15mm super wide viewing angle.8 bc game casino
The EOS R system’s large-diameter mount and short back focus distance significantly increase the freedom of bc game casino design，Therefore，RF15-35mm F2.8 L IS USM IN KEEPING CANON F2.8 series wide-angle zoom bc game casino with high image quality，Expand the maximum wide angle to 15mm。With 15mm super wide angle，Users can get more impactful viewing angles and perspective effects，No matter the scenery、Building，can further enhance the visual expression of image works，At the same time, the 15mm ultra-wide angle is also very helpful for shooting in narrow spaces。The 35mm focal length of this bc game casino can achieve a viewing angle close to the human eye，Can take into account daily street photography、Gourmet food、Creation of life images such as environmental portraits。
Canon RF15-35mm F2.8 L IS USM bc game casino
Canon RF15-35mm F2.8 L IS USM bc game casino sample
Equipped with F2 as Canon.A new generation product of 8 constant maximum aperture lenses，Canon RF15-35mm F2.8 L IS USM bc game casino uses a variety of Canon’s new optical technologies，thus throughout the entire zoom range，Achieved another improvement in image quality from the center to the edge of the screen。This bc game casino uses a bc game casino structure of 16 elements in 12 groups，Up to 5 special lenses applied，Three glass molded aspherical lenses，Realized spherical aberration correction for large aperture lenses、Wide-angle bc game casino distortion aberration correction and zoom bc game casino miniaturization，At the same time, 2 UD (ultra-low dispersion) lenses are used，Although the maximum wide angle is 15mm，Can still effectively suppress the occurrence of chromatic aberration，Thus obtaining a high level of clarity。
To achieve higher image quality throughout the zoom range，RF15-35mm F2.8 L IS USM bc game casino uses ASC air spherical coating and SWC sub-wavelength structure coating technology。ASC air spherical coating technology forms a layer of coating containing silicon dioxide and air on top of the traditional evaporation multi-layer coating，Using the characteristic that the refractive index of air is lower than that of optical glass，By including a certain proportion of air in the coating，Thereby achieving low refractive index，Especially for nearly vertically incident light，Can effectively suppress ghosting and glare caused by light reflection。SWC sub-wavelength structure coating technology forms wedge-shaped microstructures smaller than the wavelength of visible light on the surface of the bc game casino，Thereby continuously changing the refractive index，It has a good reflection suppression effect for light with a large incident angle，Can reduce the possibility of flare and ghosting around the edges of lenses with large curvatures, such as wide-angle lenses。
Canon RF15-35mm F2.8 L IS USM bc game casino structure diagram
Wide-angle end of the bc game casino (upper), telephoto end of the bc game casino (lower)
Canon RF15-35mm F2.8 L IS USM bc game casino MTF curve
RF15-35mm F2.8 L IS USM bc game casino with F2.Constant maximum aperture throughout the entire focal length of 8，And uses a circular aperture composed of up to 9 aperture blades，Available with nearly circular aperture shape，This results in a beautiful and smooth large blur effect。Compatible with F2 on camera.8-beam autofocus sensor，Can achieve higher autofocus accuracy。
Although the focal length at the wide-angle end is expanded from 16mm to 15mm，And added functions such as IS image stabilizer，RF15-35mm F2.8 L IS USM bc game casino size、Weight vs. EF16-35mm f/2.8L III USM is basically the same。The length and diameter of this bc game casino are approximately 126.8mm and 88.5mm，Weight about 840 grams。The filter diameter is 82mm。It is worth mentioning，The front bc game casino of this bc game casino is not a "bulb" type，Easy to install filters in front of the bc game casino。
Large aperture、Standard zoom bc game casino: RF24-70mm F2.8 L IS USM
EF24-70mm f/2.8L II USM is Canon F2.A versatile and popular classic and commonly used zoom bc game casino in the 8-zoom bc game casino series。Today，This classic continues into the RF bc game casino family。New RF24-70mm F2.8 L IS USM in addition to providing an easy-to-use zoom range，Also by achieving higher optical performance，And functional design including IS image stabilizer and Nano USM，Significantly enhance the attractiveness of the product。It is a new commonly used zoom bc game casino in the EOS R system，Applies from Street View snapshots to landscapes、Various shooting scenes such as portraits and short films，While continuing the high image quality characteristics of Canon L-class lenses，Maintaining the advantages of compact design and high reliability。
Canon RF24-70mm F2.8 L IS USM bc game casino
Canon RF24-70mm F2.8 L IS USM bc game casino sample
Normally，Aberration will occur due to the refraction of light，Image quality will be reduced as a result。The EOS R system takes advantage of the characteristics of a large-diameter mount and short back focus distance，Enables large-diameter lenses to be placed near the imaging surface，This reduces light refraction and the aberrations it produces，Achieve higher image quality，Also makes the overall bc game casino more compact。In addition to the above advantages，RF24-70mm F2.8 L IS USM also greatly corrects various aberrations by adding 3 glass-molded aspherical lenses and 3 UD (ultra-low dispersion) lenses，To achieve the entire zoom range，High-resolution performance from the center to the edge of the screen。In addition，This bc game casino also uses the ASC air spherical coating technology developed by Canon，Using the characteristic that the refractive index of air is lower than that of optical glass，By including a certain proportion of air in the coating，Thereby achieving low refractive index，Especially for nearly vertically incident light，Suppresses glare and ghosting that impair image quality。
Canon RF24-70mm F2.8 L IS USM bc game casino uses 15 groups、21 bc game casino structure。By optimizing optical design，The minimum focusing distance of this bc game casino at the 24mm focal length end is compared to EF24-70mm f/2.8L II USM about 0.38m shortened to about 0.21m，The minimum focusing distance at the 70mm focal length end is about 0.38m，Maximum magnification from approx. 0.21x increased to about 0.3x (at 32mm focal length)。Shorter minimum focusing distance can help photographers take close-up shots where the subject is more prominent，Achieve powerful visual effects。In addition，This bc game casino uses a 9-blade EMD circular aperture structure，The point light source in the background of the shooting screen can achieve a nearly circular blur effect。
Canon RF24-70mm F2.8 L IS USM bc game casino structure diagram
Wide-angle end of the bc game casino (upper), telephoto end of the bc game casino (lower)
Canon RF24-70mm F2.8 L IS USM bc game casino MTF curve
Appearance，Canon RF24-70mm F2.8 L IS USM bc game casino with RF15-35mm F2.8 L IS USM SAME，Adopts Canon’s new L-class bc game casino design style，More atmospheric、Simple。The length and diameter of this bc game casino are approximately 125.7mm and 88.5mm，Weight is about 900g。Filter diameter and RF15-35mm F2.8 L IS USM also 82mm，You can easily share filters of the same specifications，While improving the convenience of use，It can also reduce the number of filters purchased。
Both lenses also have the high reliability of bc game casino L-class lenses
RF15-35mm F2.8 bc game casino and RF24-70mm F2.8 bc game casino lenses adopt a waterproof and dustproof structure3，This enables high reliability in harsh shooting environments。At the same time，Both lenses are also equipped with anti-fouling fluorine coating with better oil and water repellency，While bringing good light transmittance，Easier to remove water droplets or oil stains attached to the lenses。
RF15-35mm F2.8 bc game casino (top) and RF24-70mm F2.8 bc game casino (lower) adopts a waterproof and dustproof structure
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