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

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NEX S is the highest-end model in the vivo smartphone product line and has won high market attention. NEX S has shown the high level of the flagship model in terms of display and sound quality. What about the camera?

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Lens, Focus and Metering

Overview

The NEX S uses a lift-type front-facing camera, which uses a sophisticated mechanical drive structure. The purpose of this is not to improve the image quality, but to make room for the full-vision display design forehead, forming a signature appearance, unique among current mobile phones. Because the front camera only rose when used, it once became a tool for rogue software detection. In terms of imaging-related configuration, the NEX S's front-facing camera has no special features, with a total pixel count of 8 million and an aperture of F/2.0.

NEX S adopts rear dual camera design, follows the elder one, the main and sub-combination, the sub-camera is only used as a sensor to realize the simulated depth of field blur, and cannot be used alone. The main camera lens aperture F1.8, the sensor is the Sony IMX363, with a full-pixel dual-core focus on-chip focusing system, the default is 12MP, if you use the old-fashioned phase focusing system, can be extended to 24MP. The lens equivalent focal length is about 26 mm, and the equivalent focal length recorded in EXIF is 30 mm, which is an error information.

Auto-Focus

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=ISO193;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/100seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.09.08 11:55:29
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=ISO100;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/205seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.30 20:11:47
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=1/167seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.09.02 13:08:03
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=ISO3288;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/17seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.09.07 19:20:14

In the 12MP mode, the NEX S is a full-pixel dual-core focusing system, and the focusing speed is tier 1 among smartphones. In the 24MP mode, the phase focusing system is the previous generation, and the speed is a little bit worse. In fact, with the support of the pre-focus system, it is difficult to feel the difference between the two scenes. Both are automatic and fast. In the case of very poor lighting, NEX S focus can also be kept efficient, and can even be used to shooting in the night dark street, which was unimaginable a few years ago.

The autofocus area of the NEX S is large. If the area is divided into nine squares, the auto focus area basically covers the middle area. In most of the past, the auto focus area has only a small center, and the larger focus area is beneficial to the rule of the thirds method or golden ratio composition. When the subject overlaps with the center, the focus remains at a high success rate. However, the focus logic of NEX S can continue to optimize and improve. When the background of the palace area has high contrast texture, it will affect the focus judgment and focus on the distance. This phenomenon is not unique to NEX S. To solve it, it may be necessary to introduce more AI mechanisms to improve the judgment.

Metering

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=1/2145seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 14:34:41
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=1/2565seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 14:06:36
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=1/2074seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.21 14:21:18
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=ISO685;White Balance=Auto;Exposure Bias Value=0.0EV;Exposure Time=1/33seconds;Exposure Program=Not defined;Scene Capture Type=Standard;DateTime=2018.08.11 12:14:21

The NEX S default metering is the central average mode, and the metering result is radical. This problem has been around for a long time. This is an old problem with the vivo phone, but it has not been solved, and the NEX S is the most radical one in the vivo system. The vivo mobile phone is only radically sunny, and the low light is conservative, while the NEX S is radical under the weak light. Aggressive metering can bring a bright look, but it can easily lead to a significant overflow and loss of highlight detail. Not only that, radical metering also affects the exposure time, affects the metering sensitivity linkage, and induces the system to use high-sensitivity imaging, which further affects the performance of the details.

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
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

This comparison shows the effect of metering on the details.

The NEX S has a focus and spot metering mode that can be activated by touching the screen, which can cope with the above-mentioned examples of improper metering. The linkage sensitivity has certain adaptability to the scene, and the metering result is not large, usually in the range of plus or minus 1 EV, which is easy to grasp. Both the automatic mode and the professional mode have improved the exposure compensation tool, providing a plus or minus 2 EV compensation range with a step of 0.3 EV. There is also a histogram tool in the professional mode, which is good for accurate metering.

The NEX S also supports face focusing and metering linkage. When a face is detected, the face priority mode is automatically activated to ensure that the face gets the correct exposure, while the background relies on HDR to ensure the details. This is the "AI Backlight HDR" of the vivo promotion.

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