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Yongnuo APS-C 16mm F1.8 autofocus lens evaluation! How exactly does it perform?

2023-03-25 04:05:52 [Photography art]
Yongnuo APS-C 16mm F1.8 autofocus lens evaluation! How exactly does it perform?

Yongnuo's newly launched APS-C format 16mm F1.8, equivalent to full-frame 24mm, is our most commonly used ultra-wide focal length!


This 16mm F1.8 has a clean and smooth look and design details, in keeping with Yongnuo's latest full-frame products Unite. The lens barrel is made of aluminum CNC technology, the surface is anodized, and the whole body is pure black with a few white logos, which is simple and generous. Although it has a large aperture of F1.8, its overall size is well controlled, with a maximum diameter and height of 64×69mm and a weight of about 273g. There is no burden at all for carrying it on-hook. The lens filter size is 58mm, and the front of the lens has a sunken matting thread to avoid stray light from being captured. The lens group in front of the lens presents a faint yellow-green. The official said that the lens adopts a nano-multilayer coating process, which can effectively improve the light transmittance and suppress backlight ghosting and glare. The lens has a wide, fine-grained focus ring that rotates smoothly with a slight sluggish feel. There are two function buttons on the mirror body. One is the AF/MF switch button; the other circular button is the Fn multi-function button with custom functions, which can be assigned functions with the fuselage to improve shooting efficiency. In addition, there is a USB-C type interface on the mirror body for firmware upgrade. The lens mount is cut neatly and fixed with 4 screws. The 10 electronic contacts are neatly arranged, indicating that this is an autofocus lens; there is a waterproof and drip-proof rubber ring on the outermost edge of the mount, which can protect the lens to a certain extent. Prevent water and dust from entering the lens. The optical structure used by Yongnuo 16mm F1.8 is 10 elements in 8 groups, of which 1 aspherical lens is used to compensate for various aberrations; 1 low-dispersion lens and 1 extra-low dispersion lens are used to better suppress Dispersion problem. The autofocus motor used is a numerically controlled stepping motor (DSM). In theory, it has fast start-stop speed, high focusing accuracy, and a quieter process. It is friendly to all kinds of picture shooting and video recording.

Theoretical Test

001 Resolution Test We use Sony α7MⅢ to open APS-C mode to shoot the resolution target (there is no Sony APS-C model at the moment) , and capture the center and corners at the same time to check the image quality. From the screenshots, even at the maximum aperture, the starting point of the center image quality has a good performance, the image is clear and sharp, but the image quality of the corners has a significant decline; when the aperture is reduced to F2. Corner image quality is significantly improved until F5.6-8 is at its best. It wasn't until F16 that the center and corners were noticeably softened due to light diffraction. In the 002 bokeh test, when the aperture is fully opened, the bokeh of the bokeh is obvious, the center of the bokeh is round, and the face of the figure at the focus position is clear and sharp. The flares at the corners exhibit a slight bilinearity. When you stop down to F11, starbursts start to appear. Judging from the MTF curve provided by the official, the contrast of the picture is good, the overall blurring is medium to high level, and the center image quality is excellent in terms of resolution, but the image quality of the corners does decline significantly and is relatively weak. 003 Vignetting test When the maximum aperture is F1.8, there is visible vignetting at the corners of the lens, which is a normal phenomenon; a slight reduction in the aperture vignetting will significantly improve the vignetting, and the screen brightness is basically uniform when it reaches F4. The 004 distortion test is shown in the figure below. The lens has slightly observable barrel distortion. When shooting some horizontal and vertical subjects such as buildings and line forms, it can be slightly controlled, or simply pulled back in the post-production software. If you shoot a video, because it is a 16:9 format, after the corners are cropped, the distortion has little effect. 005 Chromatic dispersion and purple fringing test When the aperture is fully open, slight dispersion and purple fringing appear in the picture. When the aperture is gradually reduced, the dispersion and purple fringing are gradually weakened. When F4 is reached, the dispersion and purple fringing are completely suppressed. Combined with tests such as resolution, it is recommended that when shooting particularly professional subjects or encountering high-contrast objects, the aperture should be narrowed to F4. When shooting into the subject, the background light spot is obviously blurred, the center light spot is rounded, and the edges and corners are squeezed into a lemon shape due to the influence of aperture erosion. The image quality in the focal plane is clear and sharp, and only a shallow depth of field is formed under the F1.8 full aperture, which is very suitable for shooting close-up and portrait subjects. 007 Autofocus The autofocus performance of this lens is very good, and as a third-party lens, it shows a high level of autofocus. In normal, fast, and slow tests, the focus can be transitioned naturally. When refocusing is blocked by obstacles, there is also a very natural focusing performance and normal focusing logic. There is no bellows during the process. 008 Breathing Effect The breathing effect is very well controlled, there is basically no visible picture stretching change, and the focusing process is natural, the speed is uniform, and the focusing process is quiet. It is a very suitable lens for video shooting.

Real shooting experience

16mm is equivalent to full-frame 24mm, with a wider field of view and a familiar and friendly perspective. With this compact and lightweight lens, it is very suitable for shopping and sweeping with the machine in hand. It is not heavy, not big, easy to carry without burden, and the 24mm angle of view is very suitable for street photography to record all kinds of beautiful scenes. When facing the empty and open river, whether it is the sky and buildings in the background, or the characters and pulp boards in the foreground, all kinds of details are included. When shooting with the hood facing the sun, the picture also has a good contrast ratio, and there is no obvious contrast reduction caused by direct sunlight. In the image below, we shot the cafe from an oblique angle, and the frame distortion control of the front door is not bad. Of course, the optical characteristic of distortion is no need to worry today, and it can basically be corrected in post-processing software. When shooting at night, the large aperture of F1.8 is considered practical. When the aperture of F1.8 is opened, there will be some vignetting around the picture of the lens, but it is not particularly obvious. If you are more concerned about vignetting, you need to narrow the aperture slightly to F2.8-4 in the early shooting, or remove the vignetting through software in the later stage. The closest focusing distance of this lens is 0.17 meters, and the magnification is 0.15 times. In close-up shots, with the blessing of the F1.8 aperture, the three-dimensional effect of the wide-angle lens can be better highlighted. In the picture, Homer's hairy mouth is clear and sharp, and the out-of-focus is hollow, and the main body is obvious. Yongnuo is the first manufacturer to mass-produce domestic autofocus lenses. In recent years, autofocus products have covered a variety of SLR and mirrorless mounts, and they have extensive experience in autofocusing. This 16mm F1.8 is very powerful in autofocus in real shooting, and can cooperate with the host to complete fast focus search and focus. The following continuous shooting is done with autofocus. The crayfish shot at night with the maximum aperture of the lens has a little dispersion in the bright parts of the corners. If you want to shoot bright objects, you can shoot with a slight aperture (or post-processing software). It produces slight ghosting when shooting in direct sunlight. On the one hand, we need to be careful to avoid it, but sometimes this feature can be used to add a little bit of style to the picture. The Yongnuo 16mm F1.8 is designed with 7 circular aperture blades, which can shoot 14 light spots. In actual use, we feel that it is quite good-looking (not too much, not too little). The fly in the ointment is that, perhaps because of the engineering sample, during the shooting, we found that when the lens in our hand is facing the strong light, there will be a relatively obvious halo in the middle of the picture (this phenomenon is theoretically caused by assembly). It is hoped that Yongnuo can solve this problem in mass-produced products.


As a domestic autofocus lens manufacturer with the strongest engineering strength and the largest factory scale, Yongnuo's comprehensive strength is closest to that of Japanese manufacturers. So if you want to own an APS-C wide-angle prime lens with a large aperture, the Yongnuo 16mm F1.8 is worth considering. Advantages: 1. The autofocus is quiet and fast. 2. The aperture of F1.8 is easy to use and practical. 3. The lens body is light in weight and small in size, suitable for use with stabilizers. Obviously 2. The maximum aperture has chromatic dispersion, and the resolution of the corners has dropped significantly

(Responsible editor:Retro)

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