Background blur

Fuzzy background involves many factors, the main factors are:

The longer the focal length, the smaller the depth of field and the more blurred the background.

Aperture The larger the aperture, the smaller the depth of field and the more blurred the background.

The closer the object is to the object, the smaller the depth of field and the more blurred the background.

Based on the above factors, when shooting conditions permit, try to shoot with the maximum aperture (small aperture value) and the longest focal length (large focal length value), and try to be close to the subject. In addition, the background should be arranged as far away from the subject as possible, so as to take pictures with blurred background and clear subject with limited equipment.

In addition, post-production can be carried out by image processing software such as Photoshop, and the desired effect can be obtained, but this kind of production requires a good grasp of image processing software.

How to blur the background

I believe everyone likes to look at photos with blurred background. Today, I will take out some photography knowledge I know to discuss with you about the problem of "how to blur the background" put forward by teacher Asahi.

Background blur, as the name implies, is to blur the background in the photo taken. The advantage of this is that it can highlight the main body.

First of all, the background blur is caused by the depth of field. What is depth of field? When we take pictures, we all need to choose a point to focus on. The part with accurate focus (focus) is clear, and the scenery before and after focus will be blurred because of out of focus. In other words, the depth of field refers to the distance from the last clear point to the next clear point. The scenery between the two is clear, and the scenery before and after is blurred. This clear range is the depth of field.

How does the camera control the depth of field? It is through the aperture and the focal length of the lens. Let's talk about aperture first. This is the main reason. Every camera has aperture control. When the aperture is large (f value is a small value), the photos will have a shallow depth of field (that is, the background is blurred), and when the aperture is small (f value is a large value), the photos will have a deep depth of field (both sides are clear). For example, photos taken with f/2.8 aperture must have a shallower depth of field than those taken with f/8. And the longer the focal length, the shorter the depth of field. The background of a photo with a focal length of 200 is definitely better than that with a focal length of 50.

If the SLR camera has a large aperture telephoto lens, the blurred background is better, but the large aperture lens is piled up with money.

For example, the aperture of our ordinary digital camera is too small, so we set it to the maximum aperture f/2.8 as mentioned in the camera. Practice has proved that the aperture f/2.8 of ordinary digital cameras is only equivalent to f/ 1 1 of SLR cameras. It is conceivable that it is very laborious to blur the background under such a depth of field.

So how do ordinary digital cameras blur the background as much as possible?

First of all, talk about composition.

(1) creates a visual gap between the subject and the background. If your camera does not have a large zoom and aperture, it is not easy to get a good background blur. But proper composition is very helpful to get a good background blur. The so-called visual gap is to keep a good distance between the subject and the background during shooting. This means that your subject should be as far away from the background as possible.

(2) causing light contrast. In order to get a good background blur, we should do everything possible to highlight the subject manually. Put your subject in a dark background, and appropriately reduce the exposure compensation when using light to darken the background and highlight the subject. This is to use the difference of light.

Then from the shooting skills.

(1) Turn off autofocus. The autofocus of a digital camera is generally three focus points, which means that it is not in line with our wishes to give consideration to the clarity of the three points after focusing. If you want to get some clear and fuzzy effects, you have to turn off autofocus and focus manually, so there is only one focus.

(2) The measurement method is changed to point measurement. The light difference between the background and the main body is caused by composition, and this advantage can be greatly exerted by spot metering. Spot metering, also called key metering, measures light within the range of 1%-5%. Spot metering is difficult to master. But in some cases, spot metering can play an important role. Knowing when spot metering should be used and using spot metering correctly can make the exposure of the subject accurate on the one hand, and create wonderful pictures that can't be seen in reality by using "sensitivity tolerance" on the other hand.

Another point, which is also the most powerful place of ordinary digital cameras, is that the focusing distance is extremely short. Some ordinary digital cameras can reach the amazing focal length of 1cm. In imaging, the closer the shooting distance is, the shallower the depth of field will be, so the depth of field of close-range or macro photos may be only one or two microns near the focus, and the farther scenes are already blurred.

To sum up, if ordinary digital cameras want to take pictures with blurred background, they should follow the following steps:

Large aperture-long focal length-close range

Friendly reminder:

There are three main measurement methods: average measurement, central key measurement and point measurement. Hehe, some ordinary digital cameras don't have spot metering, and I can't help it. If you really can't, just bite the bullet and buy a SLR camera. bbs.bztdxxl/read-htm-tid-35665

On the Ambiguity of Portrait Background

When shooting with a digital SLR camera, the background blur has little to do with the fuselage. Mainly rely on the lens to create a shallow depth of field, so as to achieve the effect of blurred foreground and background. Its basic requirements are:

First, a large aperture lens can create a shallow depth of field, preferably above 1.8, among which 1.2 and 1.4 have the best blur effect. But this kind of large aperture lens is also the most expensive;

Second, a long focal length lens can create a shallow depth of field, preferably a long focal length lens of more than 200 mm, which is much cheaper than a large aperture lens, and most people who are short of money will use a long focal length lens to blur the background.

Third, when using a large aperture or long focal length lens, try to keep the distance between the subject and the background as far as possible. The farther the distance between the subject and the background, the better the effect of blurring the background.

At present, due to the small aperture of the lens, the low precision of the focusing system and the long depth of field, the ability to blur the background is really average. However, with the development of digital technology, especially the continuous improvement of the focusing system of small digital cameras, the ability to blur the background will be greatly improved (at present, the ability of some small dv to blur the background has reached that of shoulder-mounted cameras in previous years).

What is the background blur effect?

The background blur effect mentioned by the landlord is often used for portrait and landscape shooting. Specifically, the effect of background blur is that the subject in a photo is sharp and clear, while the surrounding parts are full of illusory and hazy feelings, which is very similar to the effect of our eyes staring at a present time. The landlord can intuitively understand what background blur is in the following two pictures, and the excellent background blur effect is achieved by shooting with a large aperture lens. Generally, a lens with an aperture greater than 2 can be called a large aperture lens. When shooting, we must first ensure that there is a certain distance between the subject and the background, and then the lens aperture of the magnifying machine is to lower the F value of the lens and shoot close to the subject.

In this way, the ideal background blur effect can be obtained. The shooting effect of ordinary lens and the background blur effect of large aperture lens.

How to blur the background

This has nothing to do with the shutter,

The easiest way to blur the background is to open the aperture. (The smaller the value, the larger the aperture, indicating that F2.8 is larger than F5.6, which you should also know. )

In addition, I suggest you have a look at this article:

Photography skills: how to blur the background and highlight the subject when shooting

Author: Doumyouji Tsukasa Source: Zhongqing Online Release Time: 2004.09.24 08:57: 14.

Using some photography skills can blur the background and highlight the subject more. You can also use this technique when you don't want to shoot the background because of clutter.

The method of background blur is not as difficult as imagined. Just because of the difference of digital cameras, some may not be able to do this, and some may have unsatisfactory results.

There are three ways to blur the background:

(1) Set the zoom ratio to the maximum;

(2) Try to set the background;

(3) Increase the aperture of the lens.

If we use these three methods at the same time, we can get more obvious background blur effect.

If the camera can zoom, then set the zoom magnification to the maximum, that is, shoot the image to the greatest extent, which can blur the background to the greatest extent. If the subject overflows the screen after increasing the zoom magnification, please ask the photographer to stand back and stay away from the subject.

In addition, the blur effect after zooming cannot be achieved by using the digital zoom function, and users need a digital camera with optical zoom function.

The larger the zoom magnification, the more obvious the blur effect. A digital camera with high-power optical zoom function is particularly convenient when you want to blur the background.

There are three ways to blur the photo background:

(1) Set the zoom ratio to the maximum;

(2) Try to choose the background;

(3) Increase the aperture of the lens.

You can also blur the background by using the distance between the photographic object and the background. The farther the background is, the more obvious the blur effect is.

In order to make the background farther away, we can take pictures by changing the orientation of the subject or changing the position of the camera according to different occasions.

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Novices may be unfamiliar with the word depth of field, and many people may have never heard of this concept. But if you can understand the concept of depth of field and apply it to your own shooting, you can take more original photos. Then let's see what the depth of field is.

Simply put, the depth of field is the range of good focus. It can decide whether to blur the background to highlight the subject or shoot a clear background. In photos of flowers, insects and so on, we can often see the background blurred. However, when taking commemorative photos, group photos, scenery and other photos, the background will generally be as clear as the subject.

The easiest way to adjust the depth of field is to change the aperture size. If you make the aperture bigger, the depth of field will be shallower, and vice versa. Of course, the larger the aperture, the faster the shutter speed, the smaller the aperture and the slower the shutter speed. In this way, under the same exposure intensity, photos with different depth of field can be obtained.

Aperture is not the only factor that affects the depth of field. Short shooting distance leads to the depth of the scene, long shooting distance leads to the depth of the scene, and short shooting distance leads to the opposite. Therefore, when shooting with a wide-angle lens, it is easy to focus on the whole image, while when shooting with a telephoto lens, attention should be paid because the depth of field is shallow. Similarly, based on the point with good focus, the point near it is deeper than the far point.

The most common photos taken using the concept of depth of field are panoramic focus photos and moving focus photos. Shifting focus refers to a shooting method that completely blurs the background to highlight the subject. Often use a large aperture lens and the aperture is fully open for shooting, or use a telephoto lens. The shooting method opposite to shifting focus is called panning focus, which is often used for photos that emphasize the sense of distance.

Although it is not easy to use depth of field shooting skills, it still needs practice to improve the shooting level.

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Theoretically, blurring is achieved by controlling the depth of field, which depends on the focal length and aperture size. Depth of field is inversely proportional to focal length and aperture size.

So you see, small digital cameras don't blur easily because the aperture is too small.

In my experience, if you want to create a fuzzy background effect, there are only three ways.

1 macro. It has been mentioned before.

In the case of telephoto, the focused object is closer to the lens.

3 use ps