When it comes to F2.0 large aperture, I think many friends will be familiar with it. Whenever a mobile phone is released, various data are displayed to make people feel very powerful. However, what do these things really do? But I don’t know that the F2.0 large aperture is also one of these mobile phone data. A simple analysis of the F2.0 aperture is that the larger the aperture, the more light enters per unit time. The larger the aperture, the better the photos taken in low light environments, and the clearer the photos in low light environments. High, and the larger the aperture of the lens, the better the blur effect created. However, the blur effect is not only affected by the aperture, but also other data such as the imaging sensor.
And this F2.0 number represents the size of the aperture, from F1.0- F22 is the process of the aperture changing from large to small. The smaller the value, the larger the aperture. And the amount of light entering at each aperture step is doubled. For example, the amount of light entering at F2.0 is doubled compared to F2.8.
The reason why the aperture value is marked with F is because the aperture F = lens focal length D / entrance hole diameter φ, but this F value is only for reference, because this formula is limited to direct light. , because the camera uses too many lenses to correct the phase difference and the light loss is high, so the F value can only be used as a non-standard reference, which will lead to differences in photography between different brands of mobile phones with the same configuration. one.
As for now, the maximum aperture of SLR lenses is only F0.9, but it is not commonly used, and people are buying and using lenses. The aperture is generallyJust between F2.8-F16, the price of a lens with a higher F value is basically staggering, but a mobile phone can easily achieve F2.0. The large aperture of F1.8 must make many people have some questions. After all, the aperture of SLR lenses used by most people is around F2.8. Is it difficult to get it? Are mobile phone cameras more powerful than SLR lenses now?
In fact, the reason for this is that mobile phone cameras and SLR lenses are completely different products. The photosensitive element of a mobile phone is very small, while that of a SLR is very large. The actual physical focal length divided by the clear aperture is the aperture. Relatively speaking, the aperture data will be larger than that of some SLR lenses, and because the structures, lens coatings, and glass materials of mobile phone cameras and SLR lenses are different, zoom lenses need to correct the difference in different focal lengths, so more high-end lenses must be used. refractive index glass, and aspherical mirrors. But the consequence of this is that the more lenses there are, the more aberrations there will be, so the aperture needs to be made smaller to reduce stray light scattering in the lens.
Therefore, when using a mobile phone, never compare the camera of the mobile phone with the SLR lens. Although a small number of functions exceed those of a SLR, If you are blindly confident and dare to challenge the shooting effect of a SLR, you will definitely be beaten by the SLR so that even your mother will not be able to recognize it.
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