Not long ago, Canon officially announced the launch of a new RF lens series-RF70-200mm F2 .8 L IS USM, this lens takes full advantage of the short flange distance of the EOS R system. The length of the lens is greatly shortened to only about 146 mm at the shortest time, which is up to 27% shorter than the EF 70-200mm F2.8L IS III USM. The weight is only about 1070 grams, a reduction of about 28%. It is the shortest and lightest lens in Canon’s 70-200mm F2.8 series of full-frame lenses. The maneuverability and portability of the lens have been raised to a new level. Reduce the burden of long-distance carrying or handheld shooting. In addition, this lens is the first Canon lens to use dual Nano USM focus motors, achieving quiet and fast focusing performance. Today, let’s feel with the editor how the RF70-200mm F2.8 L IS USM, which is known as one of the “big three yuan”, performs.
This lens adopts an optical structure of 17 elements in 13 groups, with the help of 1 One glass molded aspheric lens and 1 UD aspheric lens realize spherical aberration correction and miniaturization of zoom lens. Three UD lenses and one super UD lens are arranged efficiently 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 RF70-200mm F2.8 L IS USM lens package All items
After reading the brief introduction above, let’s take a look at the appearance of this RF70-200mm F2.8 L IS USM. This lens is the first of the RF lenses to use a white coating, in addition to the heat-insulating coating on the lens body.
The lens adopts a telescopic zoom structure to achieve the full length of the lens Significant reduction and weight reduction. It is important to note that the RF70-200mm F2.8 L IS USM cannot be equipped with a teleconverter. This is also a decision to give priority to miniaturization
Both the front and rear lenses of the lens are coated with anti-fouling fluorine. The oil stains on the lenses can be easily wiped off with a dry cloth.
lens from front to The back is a black wide zoom ring, a finely adjustable focus ring, and a white control ring that is easy to grasp the amount of operation
9 aperture blades
RF70-200mm F2.8 L IS USM can select from 3 IS modes according to the shooting scene by switching the IS mode selection switch. Mode 1 is for a still subject, as long as it appears Shake, IS image stabilizer will compensate. Mode 2 is used when you want to follow and shoot the subject. Mode 3 is for subjects with irregular movements. In this mode, although the amount of hand shake is calculated in real time, the IS image stabilizer does not work during the confirmation of the composition, and hand shake compensation is only performed during exposure.
In order to match the length of the lens with the greatly shortened lens body, Canon newly developed a small tripod adapter. The knob of the tripod adapter is a conical shape that extends outwards, which is easy to rotate and disassemble. There is flocking in the ring to protect the lens body from wear.
The attached lens hood is equipped with a filter operation port. When taking landscape photos, you can operate the PL-C circular polarizing filter without removing the hood.
When you need to remove the hood, press the lock button can.
Lens distortion and flare:
in After the introduction of the overall appearance, we conducted a real shot test on the RF70-200mm F2.8 L IS USM lens. The following test pictures were taken after closing the lens aberration correction in the camera body. First, show you its glare and distortion. Flares and ghosts generally appear under backlight conditions, and we conducted test shots under extreme conditions.
70mm end F2 .8
70mm End F8
200mm End F2.8
200mm end F8
Thanks to the SWC sub-wavelength structure coating with many nano-scale wedge-shaped structures arranged on the surface of the lens, it has a good anti-reflection effect on light with a large incident angle. It can effectively suppress the glare and ghosting at the edge of the large curvature lens. When shooting with the maximum aperture at the 70mm end, there is almost no glare in the picture. When the aperture is reduced to F8, a certain starburst appears at the 70mm end, and the glare control is still excellent. The glare of 200mm at the maximum aperture of F2.8 is relatively obvious, and the light spot becomes smaller after shrinking the aperture.
telephoto lens generally speaking, no matter it is pincushion distortion or barrel distortion, it is not particularly obvious, so in the picture below we do not see the horizontal and vertical lines Some obvious deformation. At the 70mm end, the picture has a slight barrel distortion, and the 200mm end has a slight pincushion distortion, but the overall effect is not great, and it can be corrected by later software.
Lens vignetting is often found on large aperture and wide-angle lenses. Canon RF70-200mm F2.8 L IS USM lens has a constant maximum aperture of F2.8. From the real shots, it can be seen that this lens has ideal control of the vignetting angle. Only slight vignetting appears at the 70mm end and 200mm end at the maximum aperture of F2.8, and the vignetting angle gradually decreases as the aperture shrinks.
70mm end F2 .8 Vignetting performance
70mm end F3.5 vignetting performance
70mm end F4 vignetting performance
200mm end F2.8 vignetting performance
200mm end F3.5 vignetting performance
200mm end F4 vignetting performance
70-end purple fringing performance, original image 100% enlarged, F2 from left to right .8/F3.5/F4
200-end purple fringing performance, the original image is 100% enlarged, from left to right F2.8/ F3.5/F4
As can be seen from the above picture, the dispersion control of Canon RF70-200mm F2.8 L IS USM lens is very good, and there is basically no purple fringing when shooting under bright light than under backlight This benefits from the built-in super UD lens and UD lens to compensate for the chromatic aberration of magnification and improve the elimination effect of the secondary spectrum.
Center edge resolution test:
The next link may be the project that everyone cares about most-the lens resolution test. In the previous article, we can see that the MTF of this lens is very beautiful, but what about the actual shooting effect?
inside the red frame Capture position for 70mm end center and edge sharpness
70mm end, F2.8, the center of the left image is enlarged, the edge of the right image is enlarged
70mm end, F4, the center of the left image is enlarged, the edge of the right image is enlarged
70mm end, F5.6, the center of the left image is enlarged, the edge of the right image is enlarged
70mm end, F8, left Zoom in the center of the image, zoom in the edge of the right image
70mm end, F11, the center of the left image is enlarged, and the edge of the right image is enlarged
70mm end, F16, the center of the left image is enlarged, the edge of the right image is enlarged
70mm end, F22 , The center of the left image is zoomed in, and the edge of the right image is zoomed in.
As can be seen from the above screenshot, the Canon RF70-200mm F2.8 L IS USM lens performs well at the 70mm end at full aperture, from F5.6 ~F11 has outstanding sharpness, and both the center and the edges of the picture are very sharp. When the aperture is reduced to F16 or smaller, the lens is affected by diffraction and the edge sharpness is slightly reduced.
inside the red frame Capture position for 200mm end center and edge sharpness
200mm end, F2.8, the center of the left image is enlarged, the edge of the right image is enlarged
200mm end, F4, the center of the left image is enlarged, the edge of the right image is enlarged
200mm end, F5.6, the center of the left image is enlarged, the edge of the right image is enlarged
200mm end, F8, left Zoom in the center of the image, and zoom in the edge of the right image
200mm end, F11, the center of the left image is enlarged, the edge of the right image is enlarged
200mm end, F16, zoom in the center of the left picture, Enlarge the edge of the right image
200mm end, F22, the center of the left image is enlarged, the edge of the right image is enlarged
Compared to the 70mm end, the sharpness performance of 200mm is better, especially the center and edge at the maximum aperture of F2.8 The sharpness is relatively ideal. The sharpness performance of aperture F4~F11 is very satisfactory, belonging to the best imaging aperture range. Diffraction effect only starts from F16. In the case of 200mm, both the center and the edge have very good performance.
Canon RF70-200mm F2.8 L IS USM maintains high sharpness in focus, while the background is soft and overly smooth, and not stiff The sensation shows the beauty of sharp imaging and soft blur.
EOS R / RF70-200mm F2.8 L IS USM / F2.8 1/800sec ISO200
In actual shooting, even with the maximum aperture of F2.8, the in-focus performance is still sharp and the cat’s eyes are like gems Bright.
EOS R / RF70-200mm F2.8 L IS USM / F2.8 1/250 second ISO200
This lens focuses quietly and quickly. The cat takes a leisurely walk after lunch and presses the shutter when its pink tongue is spit out. It is easy to capture an interesting picture.
EOS R / RF70-200mm F2.8 L IS USM / F4 1/320 second ISO200
After shrinking the aperture slightly, this lens has the best sharpness performance, which is very suitable for shooting buildings with many details.
EOS R / RF70-200mm F2.8 L IS USM / F5.6 1/1600sec ISO200
The setting sun is setting, and the wild ducks on thin ice in the distance are photographed with backlighting. The water is sparkling, and there is no ghost in the picture. Shadow flare, a warm scene.
EOS R / RF70-200mm F2.8 L IS USM / F3.2 1/4000 seconds ISO320
EOS R / RF70-200mm F2.8 L IS USM / F4 1/160sec ISO200
Since the EF lens era, the three F2.8 constant large aperture L-class zoom lenses with focal lengths covering ultra-wide-angle to telephoto have a high reputation among users and are kind to users. It is called the “big three yuan”, and now the “big three yuan” series has been reborn in the mirrorless RF system. 70-200mm is a focal length that has attracted much attention from users. It can deal with a wide range of fields such as scenery, portraits, animals, sports, news reports, etc. Canon RF70-200mm F2.8 L IS USM makes full use of the large aperture and short rear focus distance of the RF mount The advantages of, for professional photographers and enthusiast users, as a constant F2.8 large aperture telephoto zoom lens to achieve miniaturization and high quality.
After hands-on trials, Canon RF70-200mm F2.8 L IS USM lens is very good in terms of workmanship and materials, and the various details are also very thoughtful. On the whole, RF70-200mm F2 .8 L IS USM is considered excellent in every respect. If you already have an R system model, this lens is worth buying. RF lens design has greater freedom. In the future, Canon will surely make greater progress in high-quality, high-specification, and miniaturized lens design, realizing all concepts that were difficult to apply to interchangeable lenses in the past.
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