Science popularization: the influence of aperture size on depth of field | Love playing computer - 上海419贵族宝贝-上海后花园1314-上海品茶网-阿拉爱上海

In the camera parameters of mobile phones, we can often see“ aperture ”Recently, manufacturers like to use large aperture cameras to add this word to their mobile phones. So this aperture size is important for the Depth of field What's the difference? Let's take a look now.

We use the sample to talk. Since the aperture of the camera on the mobile phone is usually fixed, I use two unused mobile phones to do a simple shooting comparison this time. One of them is Samsung Alpha version I9300 with aperture value of F2.6. The other is Sony L35h, with the aperture value of F2.4. When taking macro shots with mobile phones, the depth of field is the most prominent, so here is a simple comparison of macro samples. The shooting mode is automatic, ISO automatic, and white balance automatic. We don't discuss the white balance of the proof here, but simply look at the depth of field performance.

This is the shooting sample of Samsung I9300. From the EXIF information, it can be determined that the aperture value is F2.6.

Sony L35h took the sample, and the aperture value is F2.4. Please remember these data. The focus of the two samples is the wooden guitar ornament in front.

From these thumbnails, you may not see much difference. The thumbnails above only give you a general view, and then the key points.

The editor enlarges the two pictures, I9300 on the left and L35h on the right. Click the picture to view the large picture, and you will find that whether the surface texture of Apple or the text of the newspaper on the desktop, L35h will be more blurred than I9300. This is The shallow depth of field effect brought by the large aperture.

On mobile phones, although aperture size still has an impact on depth of field, it is not obvious. In order to make the effect more obvious, Xiaobian uses SLR to take a few pictures, and you will know it by comparing these pictures.

When watching these pictures, just pay attention to the aperture information and the changes in the background of the wooden guitar. When the aperture value is F4.0, except for the wooden guitar with clear focus in front, the rest are blurred. This is it. Large aperture, shallow depth of field.

When the aperture is 8.0, pay attention to the fruit behind the wooden guitar. Is it clearer than when the aperture is 4.0? After the aperture is reduced, the depth of field is not so shallow.

Xiao Bian further reduces the aperture to 16, and the fruit behind the wooden guitar will be clearer than when the aperture is 8.0. This is it. The smaller the aperture, the deeper the depth of field.

In fact, a simple summary is: The larger the aperture, the shallower the depth of field. The smaller the aperture, the deeper the depth of field. With a shallow depth of field, the background will be strong, while with a deep depth of field, the background will be weak.

Why do current mobile phone manufacturers like to use cameras with large apertures? That's because when shooting at macro, the scene out of focus will be blurred, and the main body will be highlighted more easily. The sample will look better. In addition, because a large aperture can increase the amount of light input, the shutter speed will also be affected when the ISO is fixed. If you want to review the relationship between aperture, ISO and shutter, you can go to《 About the phone ISO, aperture and shutter 》Take a look.