Why is there a phenomenon of virtual reality in the photos taken by automatic SLR cameras?

This is the depth of field problem of SLR camera. The so-called depth of field is the distance before and after the imaging focus to clearly image. There are three factors that affect the depth of field:

1, lens focal length. The longer the focal length of the lens, the shallower the depth of field.

2. Aperture. The larger the aperture, the shallower the depth of field.

3, distance. The closer to the subject, the shallower the depth of field.

In addition, many people think that another point is the format of the imaging unit. In fact, the format has no effect on the depth of field. The reason why ordinary DC blur effect is much better than single contrast is not because the CCD format is small, but because the focal length of the lens is very short, that's all.

As you said, if you want a clear background, you can reduce the aperture appropriately, for example, set the aperture to f11-kloc-0/6 or even F22, or stay away from people, or change the lens with a shorter focal length.