vivo NEX S Review: Camera
Author:Soomal
Source:eng.soomal.com

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Auto White Balance, Colors and Image Quality

The details of the NEX S under sunny conditions are good. The contrast of the fine texture in the bright part is no worse than that of the iPhone X. The control of the noise in the dark area is better than that of the iPhone X, but the smear of the low contrast texture is obvious. NEX S has obvious sharpening processing, we think that the sharpening is excessive, which leads to the hooking phenomenon of some contours. The "rich details" looks rich at first glance, but actually destroy the details, especially the fine texture, and then influences the layering of the image, eventually makes the picture look hard. In the above example, the wicker area of the iPhone X is softer and more detailed.

Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/1379seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 17:08:49
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/8490seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.15 15:03:57

NEX S's lens has excellent anti-glare ability. It can still maintain good contrast under the reverse glare with mild ghosting and light spots. It is slightly better than most mobile phones in the same period. It may cause fogging when the side is backlit, but it is very easy to avoid. Many mobile phones will activate HDR in the backlight scene, but HDR will cause a grayish look. In this part of the processing, NEX S is doing a good job, there is no obvious gray phenomenon.

Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO125;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/100seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.07.21 17:44:12
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/2460seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.15 14:56:29
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/3162seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.15 15:00:26
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO111;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/100seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.16 11:16:00
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/996seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.16 10:43:45
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/214seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.16 10:34:28
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/846seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 15:36:16
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/1878seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 15:41:02
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/1280seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 17:19:50
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO609;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/33seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.11 11:58:25
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO248;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/50seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.11 12:57:12
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO310;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/50seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 19:21:52
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO1400;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/10seconds;Exposure Program=Normal program;Scene Capture Type=Standard;DateTime=2018.08.21 19:34:45
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO363;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/33seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 20:25:27
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO665;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/33seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 19:47:22
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO90;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/100seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.07.21 17:49:49
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/3711seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.15 13:02:07
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/2061seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 14:25:34
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/1995seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 14:33:45
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO103;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/100seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.09.06 21:49:06
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/3879seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.09.07 11:14:53
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/2761seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.09.07 11:35:52
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO360;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/50seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.07.24 10:12:27
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO823;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/20seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.11 12:23:33

The white balance of NEX S is stable and reliable, and there may be a tendency to be cold in only a few scenes with a single color. It adds recognition to the scene and is packaged as part of the "AI". When the AI is turned on, the color will become more vivid and the saturation will be significantly improved. Even if the AI is not on, its color performance will be more vivid than the OnePlus 6. The effect of NEX S's AI on color can be considered moderate, it has an effect on saturation, but it does not have a significant negative impact on the tones, so we are still happy to use it. Some AIs will act like a master grasping your phone, and the result is to force the user to turn off the AI.

The vivo team's understanding of color is "good-looking for beauty". This view is used for the color correction of the mobile phone camera. The look and feel of the NEX S imaging give a good impression, and the look is excellent, and there is no additional sacrifice of color levels. The problem with NEX S is in the details, it is easy to find the problem when looking at the full images.

HDR is the focus of the vivo technology, and this progress can be observed on the NEX S. HDR has become less and less violent, the stability is getting better and better, the noise in the dark part is getting less and less, and the force is more appropriate. These are positive for the NEX S.

Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO881;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/33seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.11 12:09:13
Brands=APPLE;Model=IPHONE X;Lens=iPhone X back dual camera 4mm f/1.8;Focal Length=4mm;Focal Length In 35mm Format=28mm;F-number=F1.8;Metering Mode=Pattern;ISO Speed=ISO80;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/5seconds;Exposure Program=Normal program;Scene Capture Type=Standard;DateTime=2018.08.11 12:13:10

Soomal's evaluation for image quality is based on automatic metering, NEX S and iPhone X are both metering radical, but the NEX S's metering is more damaging to the details. In this contrast of low-light scenes, the iPhone X wins NEX S for the performance of the iPhone X is significantly better. NEX S's metering problem induces a series of chain reactions, metering radical -> exposure time lengthening -> increasing sensitivity -> image quality deterioration. If you use manual metering, the results are much better.

Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO483;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/50seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.11 12:09:19

This is a metering intervention using the function of focus and spot metering, and the image quality is greatly improved. It is very necessary to solve the metering problem as soon as possible to improve the picture quality. This should not be technically difficult, because the X21 has no such metering anomaly in the scene under low light.

It must be noted that this set of comparison results almost maximally reflects the problem, in fact, the gap of most scenes is not as large as this group of comparisons.

Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F1.8;Metering Mode=Center Weighted Average;ISO Speed=ISO800;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/13seconds;Exposure Program=Normal program;Scene Capture Type=Standard;DateTime=2018.08.11 12:42:42
Brands=APPLE;Model=IPHONE X;Lens=iPhone X back dual camera 4mm f/1.8;Focal Length=4mm;Focal Length In 35mm Format=28mm;F-number=F1.8;Metering Mode=Pattern;ISO Speed=ISO200;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/4seconds;Exposure Program=Normal program;Scene Capture Type=Standard;DateTime=2018.08.11 12:42:24

For example, this group.

The NEX S has an optical anti-shake system with the slowest auto shutter speed of up to 1/5 seconds, but this value rarely occurs, and more is 1/7 second, 1/9 second, 1/10 second, 1/10 second. The 1/10s is the most used gear. Its anti-shake efficiency is about equal to or less than 2 EV, which is in the upper middle level in the current mobile phone.

Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F4.0;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/2025seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.06.28 18:59:17
Brands=VIVO;Model=VIVO NEX S;Focal Length=4mm;Focal Length In 35mm Format=30mm;F-number=F2.8;Metering Mode=Center Weighted Average;ISO Speed=ISO50;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/2074seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.16 11:09:09

The rear dual-camera of the NEX S is prepared for the simulation of the depth of field. The vivo is called ¡°Portrait Mode¡±, and the actual performance is not ideal. Compared with the X20/X21, there is no improvement, and even somewhat regressed. Oops, the flaws are obvious and disappointing. The competitors of the same period, such as Apple Samsung Huawei, are making progress, and the gap between vivo and competitors in this function is growing.

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