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Mobile phone camera functions are now receiving more and more attention from consumers and manufacturers, and the ever-evolving camera has gradually become one of the selling points. Then, among the parameters propagating by the manufacturers, which manufacturers have not advertised worthy of attention, and which ones are just gimmicks? And look at the boiler for your analysis.
Regarding the photo, we are prepared to be divided into three parts, the lens, the photosensitive element, and the processor. In this article, we will first talk about what we can see: the lens.
The main keywords of the manufacturers for the lens are: aperture, optical image stabilization, lenses, and some manufacturers will also involve other conditions such as coating. We will explain these in turn.
aperture
On the interchangeable lens machine, the key words accompanying the large aperture are blurred. "The focus inside is sharp like a knife, and the focus is like a cream." This is the most intuitive feeling that a large aperture lens can bring us. . But in fact, on the roadmap of each manufacturer's lens, the description of the large aperture lens is: "snapshot lens." The same is true for mobile phones. Due to hardware conditions, the large aperture of a mobile phone is not designed for blurring. The main purpose is to enable the mobile phone to have a faster shutter speed.
Large aperture can be faster
Why is it called a snapshot lens? We may hear the phrase "photography is the art of using light". Of course, the use of light here is not to say that the SLR is three generations, so the money is used up. The amount and proportion of light will have a direct impact on the photo. In the simplest case, only when you get the right amount of light will you have a satisfactory photo effect, more, less, no.
Here we will not explain the relevant knowledge of exposure. The content of this part of the knowledge is very much online. You can find the content that suits you according to your teaching. Here we simply and rudely conclude that the other conditions are the same, the larger the aperture, the shorter the shutter time required for imaging. (Because we are only talking about the influence of the aperture here, other factors affecting the photo will be added later when we talk about the relevant content)
What can a higher shutter speed bring? If the shutter speed is slow and the subject is moving at high speed, the subject tends to falsify, such as:
At this time, if there is a faster shutter speed, then a few people around it will solidify, instead of such a "dynamic". For the filming of the baby, the cat's party, the larger aperture is practical.
So how much does the large aperture on the mobile phone increase the shutter speed? At present, the aperture size of the mainstream mobile phone is F2.2, and it is generally claimed that the mobile phone with a large aperture is F1.8, and the middle phase is half-shifted, that is, the shutter under the same conditions. Speed ​​can be increased by 50%. For example, 1/200 second can be increased to 1/300 second.
Large aperture increases the possibility of night shooting
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What is a safety shutter?
In the case of shooting night scenes, it is easy to see the situation of photo fainting, which is what we often say, shaking hands. But in fact, even if you don't shake your hand, it's easy to get mad at night scenes. The reason is actually that the shutter speed is slow.
In the camera, the safety shutter has a special formula to indicate that the safe shutter speed is the reciprocal of the focal length, that is, the safe shutter speed = 1 / focal length. In mobile phones, the shutter speed generally needs to reach 1/30 second and faster to make the photo appear not to shake. This 1/30 second is the safe shutter of the phone. If you have mastered the iron hand, or find a column, wall and other dependencies, you can slightly reduce the need for a safe shutter, about 1 / 20 seconds.
The large aperture comes in handy here. In the same scene, other mobile phones with relatively small apertures need a shutter speed of 1/15 to shoot, even if the wall is not able to be photographed, and the larger aperture of the mobile phone relies on A large aperture can have more light input, which can be taken by a shutter speed of 1/22 seconds.
However, a larger aperture will cause trouble for the lens design. Under other conditions, the larger aperture edge quality will drop more. However, in view of the fact that the mobile phone photograph is mainly used for recording, the deterioration of the edge image quality is within an acceptable range.
Optical image stabilization
The optical image stabilization of the mobile phone is anti-shake of the lens, that is, the floating lens is used to compensate for the impact of the jitter. However, some manufacturers have a slight deviation in the promotion of optical image stabilization.
In a turbulent environment, the anti-shake that optical anti-shake can provide is negligible. At this time, it is more effective. On the contrary, the faster shutter speed brought by the large aperture can fix the object to be photographed.
The biggest application of optical image stabilization on mobile phones is to image in the case of weak light conditions, extending the safety shutter time, and the general optical image stabilization effect can reach about 2 files. In the small knowledge about the safety shutter, we mentioned that the safe shutter speed of the mobile phone is 1/30s, so what is the safety shutter of the optical anti-shake mobile phone? To improve the two files, the calculation method is 1/30s×2×2, about For 1/8s, if you use some auxiliary skills, you can reach 1/5s or so. In other words, in the same situation, handheld shooting, if the mobile phone is equipped with an optical anti-shake lens, you can enter more than four times more light, which is very beneficial for night shooting.
So does optical anti-shake affect the picture quality? The answer is basically no effect.
When many manufacturers of lenses promote mobile phone cameras, they always say that the camera lens is 5P or 6P, which makes use of the inherent cognition of the Chinese people. In fact, the number of lenses has little to do with imaging.
So is the sapphire lens effective? The answer is that sapphire lenses are not so easily scratched and relatively easy to clean.
Whether it is the number of lenses or the lens material, it is just a gimmick.
In addition, large apertures and optical image stabilization can help achieve a lower ISO, which reduces the effects of noise on the picture and improves night shot quality. The reason we will talk about in the photosensitive element section.
Therefore, for the camera to take pictures, the most important thing we need to pay attention to is the aperture size and anti-shake. The conclusion is:
The large aperture is not for blurring, and the larger aperture can improve the capture ability to a certain extent;
Both large aperture and optical image stabilization can effectively improve the success rate of night shooting, and the optical image stabilization is more obvious.
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