Aperture size of mobile phone professional photography

Whether the aperture of the mobile phone is good or small, I will sort out new historical knowledge. Welcome to read!

What is an aperture?

Aperture is a device that the lens controls the amount of light entering the photosensitive element of the fuselage, which can be regarded as a round hole. Generally speaking, the aperture size is determined by the aperture and focal length of the lens. When the light passes through the lens, it shines on the CMOS photosensitive element through the aperture. Therefore, the larger the aperture of the lens, the more light enters through this aperture in unit time, the richer the information obtained by the photosensitive element, and the better the effect of the final photo. The following figure directly illustrates the relationship between aperture and light input.

The size of the aperture is generally expressed by f/x.x. Because the value of f is fixed, the smaller the denominator, the larger the aperture value. For example, the aperture of F/ 1.8 is larger than that of F/2.8. As can be seen from the above picture, the larger the aperture, the more light enters, and light is an important factor to determine the quality of a photo. Is the aperture of mobile phone good or small?

Generally, digital cameras and SLR can reduce the aperture value at will, and the lowest can reach F/44 or even F/64, but the maximum aperture of a lens is fixed. Therefore, lens manufacturers try to increase the diameter of the aperture. The larger the aperture, the higher the lens price, and some constant small aperture zoom lenses are even more expensive.

How to use the aperture?

Large aperture is suitable for shooting portraits or still life flowers, because the larger the aperture, the shallower the depth of field, which can highlight the shooting theme. The background of many photos we see is completely blurred except for the characters, which is due to the large aperture lens.

The benefits of blurring the background are obvious, especially when taking pictures of girls. With the help of background blur, all the surrounding sundries can be "erased" and only the photographed characters can be highlighted. It can be said that the blurring of large aperture background is the most basic skill in portrait shooting.

On the contrary, a small aperture is more suitable for shooting scenery. The smaller the aperture, the deeper the depth of field. Every detail of the photo taken by a small aperture is very clear, which is most suitable for shooting large-scale scenery with a wide-angle lens.

In addition, when shooting light paintings, star orbits, running water and other subjects, the aperture should be as small as possible, and the exposure time should be extended with the help of a tripod. If necessary, you need to add a filter to reduce the amount of light. Of course, these belong to the category of professional photography, so I won't go into details in this article.

Influence of large aperture on mobile phone photography

Large aperture can not only bring greater depth of field and background blur effect, but also improve the shutter speed of the camera. The security shutter of handheld mobile phone is generally around 1/30 seconds. If it is lower than this speed, blur may appear even when shooting still objects. When shooting at night, in order to ensure the lowest shutter speed, the mobile phone will automatically increase the ISO sensitivity, resulting in a lot of noise on the screen.

If the aperture of the mobile phone is large enough, the more light CMOS can get at the same shutter speed. Conversely, a higher shutter speed can be used to prevent image jitter. Therefore, when shooting moving scenes or poor ambient light, a large aperture lens has more advantages than a small aperture lens. When shooting people's still lives, the large aperture can also bring the background blur effect close to SLR.

Therefore, the camera aperture of smart phone must be as large as possible.