Why is the background of Apple mobile phone blurred?

The depth of field is the clear range before and after the subject in the photo, and the large depth of field is a photo that is clear from the foreground to the distant view.

Large depth of field effect

In photos with small depth of field, only the focused object is clear, and other places will be blurred to varying degrees.

Small depth of field effect

2. What are the factors that control the depth of field?

Aperture, focal length and object distance are three important factors that affect the depth of field of a photo:

1, the larger the aperture (the smaller the aperture value f), the smaller the aperture (the larger the aperture value f), and the greater the depth of field.

2. The longer the focal length of the lens, the smaller the depth of field, and vice versa.

3. The closer the subject is, the smaller the depth of field is, and the farther the subject is, the greater the depth of field is.

Third, the skills of iphone to take photos with small depth of field

There are also many models of iphone. Let me make a classification according to the number of lenses to explain it in detail.

1, single lens

It's a lens iphone, such as iphone6S, iphone8 and so on. The aperture and focal length of the lens are fixed, and the depth of field can only be controlled by adjusting the distance.

When shooting, try to be close to the subject, and at the same time choose a far background to focus on the subject. This shot is a small depth of field effect, and the clear background of the subject is blurred.

2, double lens

Iphone should have dual lenses of Iphone7plus, including iphone8plus, iPhone, Iphone 1 1, and Iphone 12. The auxiliary lens is a double telephoto lens with an equivalent focal length of 52 mm

We know that the longer the focal length of the lens, the smaller the depth of field will be. Therefore, shooting with this auxiliary telephoto lens, combined with distance control (technical similarity 1), can achieve the effect of small depth of field.

3. Three shots

The Pro and ProMax versions of iphone 1 1 and iphone 12 are all three-lens configurations. They are wide angle (main lens), super wide angle and telephoto. Want to shoot a small depth of field effect or use a telephoto lens with distance control.

What needs to be emphasized here is that the telephoto lens of iphone 12ProMax is 2.5 times and the equivalent focal length is 65mm, which is longer than the double focal length of other models, and the blur effect on the background is more obvious.

Supplement: Many iphone phones have "portrait" mode, which combines the function of mobile phone algorithm, and can also take a blur effect with small depth of field. In addition, the use of this portrait mode is not limited to the shooting of people, but also can be used to shoot other subjects.

It should be noted that all mobile phone algorithms have recognition errors, and iphone is no exception. When using portrait mode, it is best to choose those scenes with large contrast between the subject and the background, so that the blur effect will be more natural. Otherwise, false defects may appear.

The above is my interpretation of the small depth of field of iphone shooting, I hope it will help you. Here is the mobile phone photography manual. I'm Yang Tao. Welcome your attention, praise and forwarding support!