How to take a clear portrait with a blurred background with a SLR camera?

How to take a clear portrait with a blurred background with a SLR camera;

First of all, if you want to blur the background, there are four ways:

Make the zoom magnification (focal length) as large as possible.

The subject is as far away from the background as possible.

The lens is as close to the subject as possible.

The aperture is as large as possible while meeting the shooting requirements, that is, the f value is small.

Second, the distance between the aperture, the lens and the subject is an important factor affecting the depth of field:

The larger the aperture, the smaller the depth of field, and the smaller the aperture, the greater the depth of field.

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

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 key points

Shooting distance

The shooting distance parameters are marked in the manual of general cameras. For example, A6 10 is generally marked as 45cm to infinity. It means that if the shooting distance is less than 45cm, you may not be able to focus, and the film you shot may be empty. So how far can we get a good shallow depth of field under the premise of not less than 45cm? Strictly speaking, there is no quantitative data parameter for this distance to borrow. Because according to your composition, the range and effect of the scene you want to show, the length of zoom, and even the brightness of the environment at that time may change the distance parameter. You can only judge and determine by your own proficiency and experience. In a word, after constructing the map and imagining the performance effect, shooting at the nearest limit distance that can make the subject clear can achieve the purpose of blurring.

concentrate

It is nothing more than focusing the camera on the object to be photographed. Only when the focus is right can the film be clear. The A6 10 has three focusing modes: AiAF (Intelligent Auto-focus), center focusing and free moving focusing. I think the terminology and presentation of other brands of cameras are different, but the basic principle should be the same. According to my experience, shooting shallow depth of field is not suitable for AiAF focusing mode. Although sometimes the subject can be blurred, due to the randomness of the focus frame, it often goes to unexpected places. As a result, when checked on the computer, the subject is often empty and the background is clear. So I use the central focus mode in principle when shooting shallow depth of field. That is, center metering or spot metering in the center focusing mode.

Background selection

What kind of background is blurred has a very important influence on the whole picture effect. Generally speaking, there are many dark backgrounds used for blurring (of course, there are also bright backgrounds used for blurring). I like to use the dark side as the back. Because it is too vague, the overall effect feels good.

Extended data:

Background blur is to make the depth of field shallow and focus on the theme. If you want to blur the background, but the general DC does not have the function of large aperture, even the stupid camera can not achieve the effect of blurring the background. Generally, the best virtual method of DC machine is to shoot at a macro, but it can also be realized by other methods.

References:

Background blur Baidu encyclopedia