The effect may not be so ideal, we need to cool down the "variable aperture lens" technology

time:2023-02-08 01:13:03 author:Camera
The effect may not be so ideal, we need to cool down the "variable aperture lens" technology

The mobile phone industry in 2022 will be particularly difficult. On the one hand, due to the impact of the epidemic, user consumption will shrink; on the other hand, the involution among mobile phone manufacturers is becoming more and more serious. In addition, the innovation of mobile phones has encountered bottlenecks. In the past two years, mobile phones have been seriously complained by users and lack of innovation. This is also a major reason why many young people are reluctant to change mobile phones. A simple inventory of the mobile phones released in the past two years, especially the flagship phones, is nothing more than "bragging" at the press conference how powerful their mobile phone images are, and even comparing their products with professional cameras is somewhat embarrassing. Of course, I do not deny that the development of mobile phone imaging has been extremely fast in the past two years. Super-powerful hardware and good algorithms have indeed allowed many mobile phones to replace cameras in certain scenarios. However, with the rapid development of imaging, many new problems have also been brought about. Especially in the past two years, many users will find that their mobile phones are often out of focus when shooting close-up objects. This is the result of the outsole sensor. disadvantages. If we are using a camera, we can solve these problems by changing the aperture, but the phone is not a camera, it does not have the function of adjusting the aperture. Do we have to endure these shortcomings in the future? It just so happens that Huawei recently mentioned a very interesting point when promoting the Mate 50 series - the variable aperture lens. Figure source Huawei mobile phone official Weibo As one of the few mobile phone manufacturers in the industry that has led many image reforms, what can Huawei do with this "variable aperture lens" this time?

Is the variable aperture of mobile phone more powerful or superfluous?

First of all, we need to know what aperture is and what role it plays in shooting. For example, a friend who is short-sighted needs to squint his eyes to see things in the distance without glasses, and this is exactly what is mentioned in photography to reduce the aperture (ie pupil) to adjust the depth of field. The smaller the f-stop (the actual size of the aperture and the aperture are opposite), the more light the lens can capture, and vice versa. In places with strong light, we can bring a deeper depth of field and a clearer picture by reducing the aperture; in places with insufficient light, increasing the aperture can obtain more exposure to reduce the noise in the picture. That is to say, using different apertures in different scenes can take better-looking photos. Many readers may not know that the aperture value marked on the mobile phone lens is both the maximum aperture and the only aperture, or constant aperture, and the aperture size cannot be adjusted. In other words, the aperture of the phone's lens is fixed. Even if the aperture size is adjusted in the professional mode, the actual size of the aperture of the phone will not change. The effect of zooming in or out of the aperture can only be simulated by the algorithm of the mobile phone. To achieve large aperture portrait, large aperture landscape and other functions. When we adjust the aperture of the mobile phone, whether it is the change in the depth of field (the degree of background blur) or the change in brightness, the imaging effect is not different due to the actual enlargement and reduction of the aperture, but through the multiple lenses on the mobile phone and The SLR-like effect simulated by the later algorithm. It is no exaggeration to say that the blurring effects on mobile phones are all achieved through post-processing algorithms, and have little to do with hardware (at least not as big as we imagined). So how does the Huawei Mate 50 series break this deadlock? Although Huawei has not yet announced the specific parameters and technical details of the variable aperture lens, according to the information disclosed by digital blogger @王子百石通, the variable aperture of Huawei Mate50 Pro supports adjustment between F1.4-F4. The 6-piece fan blades can change the structure more finely, so as to make up for the deficiencies and shortcomings of the software algorithm. As for the stepless aperture, considering the space inside the phone, we should not think about it. Picture source Weibo blogger @王子百ishitong has previously posted a real shot of the rear lens of the engineering prototype of the Huawei Mate 50 series on Weibo. Although it is only a very basic model, we seem to be able to There are some clues in it. It is the blade of the lens in the upper right corner that seems to be a mechanical mechanism that can be changed. Coincidentally, there are just 6 blades in this composition, and the amount of light entering and the aperture can be controlled by controlling the blades, which greatly increases the credibility of the real picture. (The picture comes from Weibo netizen @Eric Hong) Combined with the previous description of the aperture, we can roughly guess that the Huawei Mate50 series uses a variable aperture lens mainly to take into account the amount of light in the dark environment and the shutter time in normal light. Priority is given to maintaining the brightness of the picture in a low-light environment, and the resolution uniformity is given priority in a well-lit environment. For different usage scenarios, the role of the variable aperture is highlighted. (For example, use a small aperture when shooting landscapes, and switch to a large aperture when shooting people or close objects)

How did Huawei pick up the "don't" Technology?

As early as more than ten years ago on the Nokia N86, the variable aperture technology has already appeared on the mobile phone image. Later, Panasonic, Samsung, Sony, and OPPO also launched products with variable aperture lenses, but the response was mediocre. , and in the end still going with the flow is the option to add more cameras and different focal lengths. The reason for the abandonment of the variable aperture lens on the official website of Samsung is also very simple. First, it is limited by cost, and second, the benefits and actual effects are not obvious. The addition of the variable aperture will inevitably increase the thickness of the entire lens module, but ordinary consumers may not be able to perceive the improvement in the shooting experience it brings in the first time. (Image source: DIGITAL process) In addition, the smartphone sensors at the time were very small, and it was better to directly add cameras with more focal lengths instead of adding physical variable apertures. Today is different from the past. Today, the main camera sensor of many flagship mobile phones is close to one inch, and even surpasses the frame of some card cameras. Does this mean that Huawei will be able to bring this technology back after a few years? What about an earth-shattering experience? In my opinion, there are still many doubts: 1. At present, the aperture of the mobile phone is the largest by default. The addition of the variable aperture will only reduce the aperture. No matter how to deal with it, it is impossible to violate the reduction of the aperture and lead to the loss of light. many laws of physics. How will Huawei show its usefulness in various scenarios? 2. Some people may think that the variable aperture will improve the depth of field of the big bottom close-up. In fact, this is too secondary, because the root cause of the large bottom close-up not being in focus is not the depth of field but aberration. Joining doesn't improve the situation. And when taking close-up shots, the light will definitely be partially suppressed, and reducing the amount of light will only make the whole photo look more strange. Drawing by Lei Technology, infringement is prohibited 3. As mentioned above, the aperture size is directly related to the depth of field, and narrowing the aperture can obtain a larger range of depth of field. But this is only limited to the camera lens. Because the sensor of the mobile phone is too small, the actual focal length of the lens is very short, and the effect on the camera cannot be reproduced at all. As for the various remarks on the Internet that "variable aperture can bring more light in, the blurring effect can be improved more obviously, and the quality of photos can be enhanced", etc. are all nonsense. In general, combined with previous technology and photography common sense, the variable aperture lens advertised by Huawei Mate50 series may not really make much sense. The only practical scenario I can think of is to better adjust the exposure when shooting video, but the actual effect is still not big, it can only be said that talking is better than nothing. (Picture from HoiNDI) But no matter what, I am still looking forward to the upcoming Huawei Mate50 series. As a product that has led the progress of the entire mobile phone industry many times, I believe that the Huawei Mate50 series will give us more places. Bring surprises. Huawei Mate50 series may have regrets in terms of comprehensive hardware configuration, but it will do its best to make up for it. This must be the strongest configuration that Huawei can come up with at this stage, and I hope it will not disappoint.

(Responsible editor:Memory module)