How to take a photo with a blurred background with a SLR?

The specific method of taking photos with blurred background with SLR is as follows:

Materials/Tools: SLR camera

Method:

1. Adjust the aperture size. The larger the aperture, the more blurred the background. In SLR cameras, everything below F4 is considered as a large aperture.

2. Control the shooting distance. When shooting, bring the lens closer to the subject. After focusing, the background becomes blurred. The closer you get, the more blurred the background becomes.

3. Adjust the focal length. If you can't change the distance between the person and the subject, then adjust the focal length to make the subject closer and blurred; (All above 55mm belong to telephoto)

4. Pay attention to the distance between the subject and the background. The farther the subject is from the background behind him, the more blurred the background is.

Extended materials:

For beginners, there is a big question about how to create blur effect, and to say blur, we must first say the formula of depth of field.

The depth of field in optics, especially in video recording or photography, is the distance range that can be clearly imaged in space. Although the lens can only focus the light to a certain distance, it will gradually blur away from this point, but within a certain distance, the degree of image blur is imperceptible to the naked eye, which is called depth of field.

For some images, such as landscape photos, it is more appropriate to use a larger depth of field, but in portrait photography, small (short) depth of field is often used for composition. Simply put, the smaller the depth of field, the smaller the clear range and the larger the fuzzy range. Therefore, more and more people pursue shallow depth of field, and the calculation formula of depth of field is as follows:

As can be seen from the above table, there are four factors that determine the depth of field-the physical focal length of the lens, the aperture of the lens, the distance from the focal plane to the subject and the size of speckle (related to pixels per inch), which can be summarized in two simple sentences:

1, how to blur: large frame, long focal length, large aperture, close range

2, how to blur beauty: circular aperture, fixed focus, good structure, far background?

Baidu encyclopedia-depth of field