Since 2022, when Canon launched the EOS R7 and EOS R10, the first APS-C format models of the EOS R system, RF-S lenses with APS-C format have also become the focus of development, and the RF-S18-45mm F4. has been launched one after another5-6.3 is stm、rf-s18-150mm f3.5-6.3 is stm、rf-s55-210mm f5-7.1 is STM three lenses, and in November this year, Canon released the first ultra-wide-angle zoom lens in the RF-S series of lenses, the RF-S10-18mm F45-6.3 is stm。The wide viewing angle of 10-18mm is not only suitable for scenery, travel, and daily street photography, but also very suitable for vlogging and live broadcasting.
For APS-C format ultra-wide-angle zoom lenses, Canon has a lot of experience in developing them, having introduced the EF-M 11-22mm F-4-5 for the EF-M mount6 is STM, and the EF-S 10-18mm F 4 was also released in the EF mount5-5.6 is stm。The RF-S10-18mm F4. is available for the RF mount APS-C format model5-6.3 is STM, the lens body design is very small, with the set of lenses RF-S18-45mm F45-6.3 is stm very close. So what's so special about this ultra-wide-angle zoom lens from Canon in terms of parameters?rf-s10-18mm f4.5-6.3 is STM with the "predecessor" EF-M 11-22mm F 4-56 is stm、ef-s 10-18mm f/4.5-5.What are the highlights of 6 is STM?The following author compares the paper parameters of the three lenses:
Comparison of specifications (click on the image to enlarge it).
Optical structure. Judging from the specifications, the RF-S10-18mm F45-6.The 3 IS STM is significantly shorter and lighter than its predecessors, with the Socket RF-S18-45mm F45-6.3 is stm. This lens achieves miniaturization and reduces the number of elements in the structure by adopting a lens structure that is suitable for short back focusing distances and effectively using aspherical lenses. In addition, Canon corrects chromatic aberrations over the entire zoom range by equipping it with two UD elements. Compared to the other two lenses, the RF-S10-18mm F45-6.The 3 IS STM has some close-up capability, with a minimum focusing distance of 86cm (10mm manual focus) with a maximum magnification of 05x (at 10mm manual focus) The lens also supports optical image stabilization for 4 levels of image stabilization, and 6 levels of collaborative image stabilization with the EOS R7.
Let's take a look at the RF-S10-18mm F45-6.3 is STM official MTF curve:
Comparison of MTF curves.
with EF-S 10-18mm F45-5.6 is STM compared to RF-S10-18mm F45-6.3 The overall performance of STM is similar, with the S-curve (solid line, indicating the imaging performance radial pattern from the center) performing better than that of the EF-S 10-18mm F45-5.6 is stm a little better.
As for how this ultra-wide-angle zoom lens actually imprints, the author will test it in detail later.
Exterior and details
rf-s10-18mm f4.5-6.3 is STM design with RF-S18-45mm F45-6.The 3 IS STM is similar in that it features a retractable tube design that locks or untracts the lens barrel by rotating the zoom ring, which further reduces the length of the lens. The two lenses are also very close in size and weight, the RF-S18-45mm F45-6.3 is stm is 69 443mm 130g，rf-s10-18mm f4.5-6.3 is stm, then 69 449mm 150g。
10mm end.
18mm end.
rf-s10-18mm f4.5-6.The 3 IS STM is designed with an external zoom design, and there is not much difference in the length of the inner barrel of the lens at the 10mm end and the 18mm end.
rf-s10-18mm f4.5-6.The 3 IS STM filter has a 49mm aperture, which is the same as the RF-S18-45mm F45-6.3 is the same as stm, and the versatility is very good. In addition, Canon has effectively suppressed ghosting with optimized lens shapes and coatings.
Diamond-patterned control ring.
Strip zoom ring.
rf-s10-18mm f4.5-6.The 3 IS STM is a non-red-ring lens, without any switches or buttons on the lens body, and because there is no independent focus ring, it adopts a "double ring" design of zoom ring and control ring. As with other RF lenses, the control ring is the focus ring by default, and common functions such as shutter speed, iris adjustment, etc., can also be assigned. The diamond-shaped anti-slip design on the surface of the control ring provides a good feel and facilitates blind operation when viewing the viewfinder, improving the ease of operation.
rf-s10-18mm f4.5-6.The 3 IS STM uses an STM stepper motor with a lead screw type unit to achieve high-speed, high-precision focusing when shooting**, and quiet and smooth focus tracking when shooting movies.
rf-s10-18mm f4.5-6.3 IS STM has a built-in optical hand shake compensation mechanism. The gyroscope sensor of the lens detects shake and compensates for shake at up to 4 shutter speeds. When paired with EOS R series models with in-body stabilization, such as the EOS R7, the camera and lens can be stabilized in tandem, resulting in shake compensation at up to 6 shutter speeds.
Lens mount. The lens mount is made of engineering plastic. The RF mount is fully electronic, with 12 contacts for high-speed information transmission between the lens and camera.
Imaging Tests:
Let's take a look at the actual shooting effect of this ultra-wide-angle lens: the author tested the Canon EOS R7 as the body. Shoot using RAW+JPEG, AWB settings, ISO 100.
10mm viewing angle.
18mm angle of view.
Before the test, let's take a look at the difference in the angle of view of this lens, and we can see from the above picture that the 10mm end is obviously much wider than the 18mm end, which can include more scenes, and bring impactful performance when shooting landscapes.
First, lens sharpness
To test the RF-S10-18mm F45-6.3 is the resolution of STM, we use the method of shooting buildings from a distance, which is often used by general users to shoot landscapes.
10mm end.
Sharpness tests the location of the capture.
Left: Center Right: Edge
f/4.5 (Click image for full size).
f/5.6 (Click image for full size).
f/8.0 (click image for full size).
f 11 (click image for full size).
f 16 (click image for full size).
f 22 (click image for full size).
From the actual measurement, it is not difficult to see that the 10mm end f 45. At full aperture, the center of the frame is sharp, and the edges are a little worseThe aperture receives f 5At 6 o'clock, the sharpness of the center of the lens does not change much, it is still sharp, the sharpness of the edges has been improved to a certain extent, and the vignetting angle has been reducedAt f 8, the lens maintains a good level of sharpness both at the center and at the edgesWhen the aperture receives f 11, sharpness begins to decrease;Acutance drops noticeably from F 16 to f 22, and image clarity is severely affected by diffraction, so these two stops of aperture are not recommended.
18mm end.
Sharpness tests the location of the capture.
Left: Center Right: Edge
f/6.3 (Click image for full size).
f/8.0 (click image for full size).
f 11 (click image for full size).
f 16 (click image for full size).
f 22 (click image for full size).
f 32 (click image for full size).
Looking at the 18mm end of this lens, the overall performance is slightly better than the 10mm end, with a wide open aperture f 6At 3, the center sharpness of the lens is good, and the edge sharpness is also goodAt f 8, the lens has very good sharpness both in the center and at the edges;At f-11, acutance begins to drop slightly;Sharpness decreases significantly at f 16;F 22-F 32 is affected by diffraction, and the whole picture is pasty, so it is not recommended.
Two. Distortion and vignetting
1.Distortion
Distortion is one of the five basic aberrations that does not affect the fineness of the lens. In photography, the general wide-angle lens is prone to barrel distortion. Telephoto lenses are prone to pincushion distortion. The distortion is proportional to the cube of the vertical height of the object point from the optical axis, so the distortion of the four corners of the object image is greater than that of the four sides of the object image. The focal length of the lens we tested was 10-18mm, and it is common for this ultra-wide-angle lens to exhibit noticeable barrel distortion.
The 10mm end is not turned on to correct the distortion performance (click to view the larger image).
Turn on the 10mm end to correct the distortion performance (click to view the larger image).
The 18mm end is not turned on to correct the distortion performance (click to view the larger image).
The 18mm end is turned on to correct the distortion performance (click to view the larger image).
It should be noted that the "distortion correction" of this lens on the EOS R7 body is gray and cannot be set, and the JPEG straight out lens has been corrected in-camera, and there is only a very slight barrel distortion at the 10mm and 18mm ends, and the distortion effect is negligible. After the RAW file is imported into the ACR, the current ACR does not support the correction file, and there is a very obvious barrel distortion at the 10mm end, for this lens user, there is no need to dig deeper, and the correction distortion is usually turned on by default, and the distortion is relatively low, which will not affect the **or**.
2.Vignetting
"Loss of light" is commonly known as vignetting, which refers to the phenomenon of darkening the four corners of the picture against the scene with uniform brightness, and vignetting is inevitable for any lens. Generally speaking, the front lens uses a large-diameter lens to ensure sufficient light intake, which can play a role in lightening. Let's take a look at the vignetting of this lens:
10mm end f 45-6.3. Vignetting (click to enlarge the image).
18mm end f 63-f/8.0 vignetting case (click on the image for full size).
From the vignetting test, the vignetting angle of the 10mm end is more obvious than that of the 18mm end when the 10-18mm end is fully open, and the aperture of the 10mm end is reduced by 6At 3 o'clock, the vignetting angle is greatly reduced;The vignetting angle is relatively light when the 18mm end is fully open, f 8At 0, the effect of vignetting can already be ignored. If you are more concerned about the effect of vignetting, you can turn on the "peripheral light correction" in the machine.
Three. Purple edge performance
We photographed the interior chandelier with the edge of the lens, and we could tell the degree of dispersion by the edge of the lamp because of the large light ratio formed by the wall of the chandelier's shadow.
10mm end f 45-f/5.6. Purple edge case (click to enlarge image).
18mm end f 63-f 8 purple fringing (click to enlarge image).
From the figure, we can see that there is only a slight purple edge at the 10-18mm end or at the 18mm end, and the purple edge will be further reduced when the aperture is retracted, which is basically negligible. We can see that this lens has 2 UD lenses, which can effectively reduce color halo when fully open, and considering that the aperture of this lens is not large, the effect of chromatic aberration is not obvious.
Four. Anti-glare performance
10mm f/4.5. Anti-glare effect (click on the image to enlarge it).
10mm F8 anti-glare effect (click on the image to enlarge it).
18mm f/6.3. Anti-glare effect (click on the image to enlarge it).
18mm F8 anti-glare effect (click on the image for a larger view).
Canon did not officially give what coating the new lens would use, but claimed that it had worked on the shape of the lens to suppress ghosting. In order to verify the actual effect, we shot the sunlight shining through the left side of the wall, and the 10mm end performed well from the actual shot, and there was no obvious ghosting either when it was fully open or closed to f 8The performance at the 18mm end is a bit worse, with some ghosting and flare at full opening, and some changes in the shape of stray ghosting at f 8 aperture. When using the 18mm end, try to avoid facing strong light to avoid affecting the picture.
Five. Stabilization test
The RF-S10-18mm F45-6.3 IS STM's IS optical image stabilization supports jitter compensation at up to 4 shutter speeds. When paired with the EOS R series cameras with on-body image stabilization, it achieves coordinated image stabilization and supports shake compensation at up to 6 shutter speeds.
Stabilization tests the capture position.
Compare with stabilization off and on (click image for full size).
Judging from the actual shot, this ultra-wide-angle lens is 06 seconds shutter speed, it is difficult to shoot a clear picture with anti-shake off, if you turn on anti-shake, the success rate will be significantly improved, in the actual low-light low-speed shutter speed of this lens and EOS R7 The coordinated image stabilization can play a good role in image stabilization and improve the production rate.
6. Vlog function
rf-s10-18mm f4.5-6.The 3 IS STM with the APS-C FORMAT EOS R series models are compact and lightweight, highly mobile, and convenient for one-handed handheld vlog shooting. Thanks to the wide field of view of 10-18mm, it can easily fit in the main character and a large area of background behind the main person in narrow rooms and the anchor's single person** to obtain the ideal picture effect.
When this lens is paired with EOS R7, it has lens image stabilization + body image stabilization + movie digital image stabilization, and the three stabilization synergies help to shoot some walking scenes.
10mm vlog viewing angle.
18mm vlog viewing angle.
Live vlog demonstration.
Judging from the actual shots, the RF-S10-18mm F45-6.The 3 IS STM is equipped with three kinds of coordinated image stabilization, which can stabilize the image even when walking, and at the same time, the focal length of the 10mm and 18mm ends changes, and we can see that the wider angle of view of the 10mm end can explain the environment of the character, compared to the 18mm end, which focuses more on the close-up of the person's head.
Samples of actual shots
Test summary
From the previous test, we can see that the RF-S10-18mm F45-6.3 is STM, with better sharpness and dispersion control in the center of the frame, support 6 levels of collaborative image stabilization and focus breathing correction, for novices can experience the impact of ultra-wide viewing angles outside the pullover, compact and lightweight, but also helpful for handheld vlogs. In addition to being suitable for landscapes, travel and other themes, the wide angle of view can cover characters and backgrounds in narrow spaces and single-person situations.
rf-s10-18mm f4.5-6.The advent of the 3 IS STM further expands the range of RF-S lenses and extends the wide-angle focal length of the RF-S lens series, allowing users to have more focal length options. Same as the previously released RF-S18-45mm F45-6.3 is stm、rf-s18-150mm f3.5-6.3 is stm、rf-s55-210mm f5-7.The 1 IS STM focal length covers a wide focal length range of 10-210mm (16-336mm equivalent full-frame equivalent). It is worth noting that all four RF-S lenses have optical image stabilization, making shooting more stable. The diameter of the mirror body is close to that for easy storage. There is no burden to carry out and can be used for shooting in a variety of fields.
Pricing-wise, the Canon RF-S10-18mm F45-6.3 is STM is 2599 yuan, similar to similar products on the market**, considering the 10mm ultra-wide angle of view and collaborative image stabilization, this price is quite cost-effective, for EOS R50, EOS R10 users, it is a cheap and high-quality vlog lens.