[Bestbuy618 digital channel] Since the beginning of the first year of full-frame micro-single camera, major manufacturers have been working hard to expand the full-frame micro-single lens group. As we all know, the Canon white gun array of the SLR era is the best there is, and it has made significant contributions to sports, ecology, and astronomy. The most commonly used white gun for ordinary consumers is the telephoto zoom lens EF 70-200mm f/2.8L IS III USM.
This year, Canon launched a new micro RF mount system for the wide-angle zoom lens RF15-35mm F2.8 L IS USM, standard zoom lens RF24-70mm F2.8 L IS USM, after the non-stop release of the telephoto zoom lens RF70-200mm F2.8 L IS USM, so Canon completed the RF Canon finished the layout of the RF mount system big three lens in the shortest time possible. Nowadays, there is a rumor in the market that “micro single is not micro,” the main reason being that the micro single camera lens is too large, even if the micro single body is light enough, but after the lens is installed, the original lightweight advantage is lost. The%20RF70-200mm%20F2.8%20L%20IS%20USM%20has%20an%20overall%20length%20of%20146mm%20at%2070mm%20focal%20length,%20which%20is%2027%%20shorter%20than%20the%20EF%2070-200mm%20f/2.8L%20IS%20III%20USM%20.
Furthermore, the new lens reduces its weight by approximately 28% to only about 1070g, and such a lightweight design will make people more eager to carry and shoot. In addition to portability, the quality of the lens image is the deciding factor for people to choose to buy it. Canon has officially posted on its product page, RF70-200mm F2.8 L IS USM and EF 70-200mm f/2.8L IS III USM each MTF curve for comparison reference.
Based on the official data, we can see that the RF70-200mm F2.8 L IS USM still has outstanding image quality performance despite the size reduction. However, because it is the official reference data, the actual imaging performance is still subject to real-world testing. So, without further ado, let’s see its true strength.
As previously stated, the RF70-200mm F2.8 L IS USM has grown significantly in size. The new external zoom design makes the entire lens smaller, lighter, and more portable at the 70mm focal length. The RF70-200mm F2.8 L IS USM inherits Canon’s classic white gun genes, and the white color scheme is even whiter throughout. The zoom ring is at the front, the control area is in the middle, and the focus ring is at the back.
In addition, near the bottom is a multi-functional control ring unique to RF mount lenses, which can be customized for common parameters such as aperture, shutter, and ISO. The lens has a 13-group, 17-element optical design, including one glass molded aspherical lens, one Super UD (Ultra Low Dispersion) lens, three UD lenses, and one UD aspherical lens. The new lens also has three IS modes that can be adjusted using the slider in the control area.
The RF70-200mm F2.8 L IS USM, which for the first time has a new floating focus mechanism, is equipped with two NANO USM ultrasonic motors capable of driving two separate sets of lenses for high-speed, precise, and smooth focusing.
To match the RF70-200mm F2.8 L IS USM’s external zoom design, the RF70-200mm F2.8 L IS USM is structurally pre-programmed with an air path to effectively stop dust intrusion. In terms of accessories, the RF70-200mm F2.8 L IS USM’s hood is the first to be painted white and is reserved for a circular polarizing filter adjustment window that allows filter adjustments without removing the hood. We set the sensitivity to 100 in the resolution test and shot at progressively smaller apertures.
70mm The center of the image is of very high quality at the 70mm focal length, with excellent performance at all apertures. At the maximum and minimum apertures, there is a slight loss of sharpness at the edges, but this has no effect on the overall image.200mm At 200mm, the RF70-200mm F2.8 L IS USM delivers excellent image quality at both the center and the edges. The experiment was carried out under extreme direct light conditions, with progressively smaller apertures.
70mm The ghosting phenomenon appeared at the large aperture at the 70mm focal length due to direct dislike of the light source, but it was not very serious until the aperture was reduced and the ghosting phenomenon became slightly obvious. However, the new lens at full aperture for flare suppression is quite outstanding, with no flare appearing the entire time.200mm At the 200mm focal length, slight ghosting was still present, and the ghosting effect did not appear until the aperture was reduced. However, glare suppression is still excellent, with no flare at all, and we can clearly feel the great effect of SWC coating in real-world shooting when shooting outdoors.
The built-in Super UD (Ultra Low Dispersion) lens on the RF70-200mm F2.8 L IS USM has a low-refraction, low-dispersion effect. The secondary spectrum elimination effect is improved by using the Super UD lens and UD lens, and two UD lenses can achieve an effect similar to that of a fluorite lens with good chromatic aberration compensation performance. RF70-200mm F2.8 L IS USM is extremely strong in dispersion suppression.
It took me a long time to go through the entire high-contrast area of the frame to find the flaw in this area, and the dispersion suppression is even better at the 200mm end, where the high contrast area is difficult to find dispersion phenomenon. The RF70-200mm F2.8 L IS USM performed flawlessly in this test item.
200mm The RF70-200mm F2.8 L IS USM also has excellent aberration control. The 70mm end has a small barrel trend, whereas the 200mm end is very firm, with no cushion-shaped aberrations.70mm200mm At maximum aperture, both the 70mm and 200mm have dark corners around them. The dark corners vanished completely when the aperture was reduced by one stop. Anti-shake test
Canon has improved the IS image stabilizer control algorithm for the new lens, which works in tandem with the dual detection IS function. The amount of shake can be detected during shooting by comparing and analyzing image information from the lens’s gyro sensor and the camera’s CMOS image sensor, and the information can be compared and analyzed to detect low-frequency shake such as slow shaking of the subject with high precision and compensate for it. The RF70-200mm F2.8 L IS USM has a powerful IS with approximately 5 levels of hand shake compensation.
The lens body has three anti-shake modes, mode 1 for still life, mode 2 for sports, and mode 3 for tracking. For the test, we used mode 1 for still life photography.70mm As you can see, there is a significant difference between the RF70-200mm F2.8 L IS USM with stabilization mode on and off. Images taken with a 1/5 shutter speed are still usable when stabilization is enabled.
When the stabilization is turned off, the shutter blurs at 1/20.200mm. At the 200mm focal length, blur appears at 1/25, and superimposed shadows appear at 1/13.
A slight blur appears at 1/6 of the frame when stabilization is enabled.
Exemplifications Not only does the optical quality continue the excellent lineage of Canon SLR white gun, but it also establishes a new standard for the microsingle system telephoto zoom lens. It is a worthy Canon special micro users, or even other brands of users (via the adapter) to obtain the big three lenses.