Nikon Z 20mm f/1.8 S review: comprehensive interpretation of scenery artifacts
This article comes from Pacific Computer Network
The exciting Nikon Nikkor Z 20mm f/1.8 S finally arrived It is not difficult to see from the parameter naming that this is a large aperture scenery lens, and it is also a lens that many photographers have been waiting for. This time Nikon defines it as a star weapon. The Nikon Nikkor Z 20mm f/1.8 S has an excellent point image restoration capability. Even small dot images on the edge of the screen can be truly restored to point images. To put it simply, it is very effective to reduce the smear caused by the movement of the stars when shooting the starry sky, so that each star emits a little light. In addition to excellent spotlight restoration, for a 20mm wide-angle lens, this also solves the pain points of edge distortion. These characteristics are also suitable for night scenes and indoor shooting. The restoration of hundreds of lights at night, narrow old streets or shining busy cities are very suitable for its use. The Nikon Nikkor Z 20mm f/1.8 S will become an essential accessory for many photographers.
One, Nikon Nikkor Z 20mmf/1.8 S appearance evaluation
The classic Nikon Z The style of the bayonet lens is almost the same as the previously released NIKKOR Z-mount S-type lens f/1.8 series. The exterior is black-coated, which is sturdy and durable. The attributes of the fixed focus lens make the lens body without redundant control buttons. Very simple. The lens body is slightly longer, about 108.5mm from the mount. Although it is the longest among the several NIKKOR Z-mount S-type lenses that have been sold in f/1.8 series, it feels very good in hand. , Just one hand can control. The whole lens weighs about 505g, which is just right for this volume and can feel the solid workmanship of the S-type lens.
lens front diameter It is 84.5mm and uses a 77mm size filter, which is also the largest in the NIKKOR Z-mount S-type lens f/1.8 series. As a large aperture wide-angle lens, this size is very acceptable.
Lens hood Part, using the more common “lotus shape” design, model HB-95. The inside of the hood is designed with a striped ring. When the light beam enters the lens from all directions, the striped ring can “break up” the light beam and reduce the impact of flare or ghosting on the lens.
just got it With this lens, most people’s attention will first stop on the focusing ring, which takes up about 50% of the lens body area. Using the infinitely controlled metal stripe design, it turns very smooth and comfortable. This focus ring can be customized to ISO or aperture adjustment and other functions in the body, but it is still recommended to set the default focus function, because the area of the control ring is relatively large, when the lens is held by hand, it will Misoperation occurred.
The whole lens There is only one switch button, which is the auto/manual focus switch on the side. The anti-shake switch is cancelled for all series of Nikon Z mount lenses. Nikon has made such a consistent and simple design layout to make the Z-mount lens have consistent handling. Even if the lens is changed, it can operate smoothly in accordance with familiar usage habits.
The internal structure of the lens It is an S-type luxury lens group configuration, composed of 11 groups of 14 lenses, including 3 low-dispersion ED lenses, which effectively solves the dispersion problem of general lenses. Although general optical lenses have low spherical aberration, they are in point image Play an important role in reduction. The lens has a nano crystal coating, which effectively reduces the effects of ghost and flare caused by the sun in wide-angle landscape photos, and presents clear images. Immediately enter the actual combat test, let’s take a look at the evaluation of various parameters.
Second, Nikon Nikkor Z 20mmf/1.8 S sharpness evaluation
It is necessary to record as many details as possible when shooting landscape works. So the resolution and sharpness of the lens are very important. The test method this time is to shoot the text in the magazine with different gears in different stages, and take 100% screenshots of the center and edges to observe and compare.
As can be seen from the screenshots, the sharpness of this NIKKOR Z 20mm f/1.8 S maintains the high level of the S-type lens series. The sharpness and resolution of the center of the aperture are very high. Although there will be a slight degradation in the most extreme apertures of f/1.8 and f/16, the difference is not obvious. The edge image quality is a bit inferior, and the sharpness is highest in the three gears of f/4, f/5.6 and f/8. The other gears can still see the difference, which is slightly fleshy. But after all, this is a wide-angle lens, and this performance of edge image quality is reasonable.
3. Nikon Nikkor Z 20mmf/1.8 S anti-glare distortion evaluation
Anti-backlight, anti-glare and anti-ghosting can be one The most important parameter of a landscape lens. Who wants to see a magnificent landscape work destroyed by glare and ghosting? In terms of anti-glare and anti-ghosting, it is precisely this NIKKOR Z 20mm f/1.8 S’s unique skill. Apart from the help of the hood, the biggest credit is the nano crystal coating. It can be clearly understood from the animation that the light source is placed a little bit from the center of the screen. This position is the easiest place for ghosting, and the surrounding environment is almost completely dark. In this most demanding test environment, there is no glare or ghosting in the full aperture range! If you want to add some glare to your work, I’m afraid it will be added later.
distortion test is also A wide-angle lens is an inevitable project. The reason for this distortion is actually caused by normal perspective. One way for humans to judge the distance of an object is to use the relative size of the object. The same method is used to express the perspective relationship in photography. The closer to the subject, the more severe the distortion. In this distortion test, a relatively flat wall was selected. The shooting distance was about 1 meter. It can be seen that the lines of the wall are slightly deformed at the edge of the picture, but for the 20mm wide-angle lens, the distortion has been controlled very well.
4. Nikon Nikkor Z 20mmf/1.8 S dark angle dispersion evaluation
vignetting will exist in any lens, and wide-angle lenses will appear The reason for the vignetting is mostly the use of too many color filters, which increases the lens barrel, resulting in vignetting in the corners. Let’s take a look at the vignetting control performance of this Z 20mm f/1.8 S. The vignetting compensation of the fuselage was turned off when shooting the proofs, restoring the most real situation.
From the above animation, we can see that the vignetting is obvious at f/1.8, and then it improves gradually. After f/4, there is no obvious dark angle. Z 20mm f/1.8 S has a relatively long lens body, which can completely eliminate vignetting after f/4. It seems that Nikon’s technology has taken a step further.
Next, let’s take a look at the dispersion performance. The Z 20mm f/1.8 S has three low-dispersion glass lenses. The functions have been mentioned above, so I won’t go into too much here. . The test method is to observe the junction of the leaves and the sky in high contrast.
From the screenshots of various levels of aperture, it can be seen that the screenshot 1 close to the center of the image has purple fringing at f/1.8 and f/2.8, but close to The screenshots at the edges of the image show no dispersion at all apertures.
5. Nikon Nikkor Z 20mmf/1.8 S Blurred point image restoration ability evaluation
Nikon Nikkor Z 20mm f/1.8 S As a landscape lens, although blur is not its focus, with a large aperture and 0.2m ultra-close focusing distance, the soft blur out of focus is still very pleasing.
The ability to restore point images is the characteristic of this lens. It is a bit unrealistic to photograph the starry sky under urban light pollution. Finally, I found a scene with more point light sources and took a sample test.
can be from the sample Seeing that the point image restoration ability is very outstanding, the red circle marks the point image at the center and edge of the image, and there is no distortion or starburst.
6. Nikon Nikkor Z 20mmf/1.8 S focusing real shot proofs
This Nikon Z 20mm f/1.8 S uses advanced Ultrasonic focus motor, although there is a slight “click” sound when focusing, it has improved a lot compared to the previous lens. The sound of the motor is not heard at all in a not very quiet environment. Only the hand is holding the lens to focus. At that time, the vibration of the motor is slightly felt. In addition to shooting landscapes, the 20mm focal length is also very suitable for Vlog shooting. The autofocus speed and accuracy are a big surprise for this lens.
There is serious light pollution in the bustling downtown of Guangzhou, and shooting the starry sky is “mission impossible”. Starry sky photography must be strictly isolated from light pollution, and mountain tops in the suburbs are the best choice. The rainy season begins in Guangzhou in March, and the proofs can only be shot indoors.
this time The whole process of shooting the proofs was taken in rainy days and indoors. In most cases, the ambient brightness is insufficient. The advantage of the large aperture is immediately reflected. The ISO can be controlled relatively low, and the resulting photos are rich in detail and very clean. The starry sky mirror is also suitable for shooting night scenes.
Seven, PConline evaluation summary
Nikon Z mount series lenses have always been characterized by high resolution, S-type lens f/ The 1.8 series lens is the representative of the highest level. The ultra-high image quality of the NIKKOR Z 20mm f/1.8 S fits well with the positioning of its landscape lens. When the aperture is fully opened, there is no need to worry about image quality degradation. Shooting stars can achieve a very high level of point image restoration, which can maximize Improve the shooting success rate.
Nikon has already sold almost all NIKKOR Z mount S-type lenses before f/1.8 series of lenses, including 24mm, 35mm, 50mm, 85mm and this time 20mm, I believe there will be the last Z 28mm f/1.8 S. Since Nikon launched the Z series micro-single in August 2018, it has almost completed the f/1.8 series family bucket in less than two years. It can be seen that the emphasis on this product type may be released in the future. Bull’s head”.
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