How does Canon IXUS 105 shoot the blurred background of characters, and how to set the specific parameters? Or parameter settings suitable for outdoor portrait shooting.

There are four methods 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. (4) The shorter the shooting distance, the better, but the general DC does not have the function of large aperture, and the fool camera can't 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. If the camera can zoom (this zoom refers to optical zoom instead of digital zoom, which can't achieve this effect), then set the zoom magnification to the maximum, that is to say, shoot the image to the maximum extent, which can blur the background to the maximum 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. The larger the zoom magnification, the more obvious the blur effect. The aperture of some cameras can't be set as a constant aperture, and the aperture is shrinking when the zoom factor increases, so the blur effect is not good. (1) shooting distance The shooting distance parameter is marked in the manual of general cameras. For example, XUS 105 is normally marked as 22cm to infinity. It means that if the shooting distance is less than 22cm, 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 22cm? 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 short, after constructing the picture and imagining the performance effect, shooting at the nearest limit distance that can make the subject clear can achieve the purpose of blurring. (2) Focusing is nothing more than focusing the camera on the subject to be photographed. Only when the focus is right can the film be clear. Move freely to focus. 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. (3) What kind of background is blurred has a very important influence on the whole picture effect. Generally, the background used for blurring is dark (of course, there is also a bright background). I like to use the dark side as the back. Because it is too vague, the overall effect feels good. No matter how good the subject is, if the background is not ideal, the overall effect of the picture will be greatly reduced. Therefore, when you want to shoot a film with a shallow depth of field, you should first observe and ponder what angle is the best. You can flexibly change the orientation and angle of view of the subject, and try to choose the relatively single and dark direction of the background picture and the background light and dark surface. It is also important that the background should be as far away from the subject as possible. Obviously, the subject and the background are very close, and even almost stick together. Even if you have thousands of skills, it's hard to blur the background. Unfortunately, 105 only has 4 times optical zoom, and the effect will not be very good.