How to blur the background with SLR?

The large aperture of SLR cameras generally refers to the aperture with F value less than 2.8. Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens, usually in the lens. The f value is used to indicate the aperture size. For the manufactured lens, the diameter of the lens cannot be changed at will, but the luminous flux of the lens can be controlled by adding a polygon or circular aperture grating with variable area inside the lens. This device is called an aperture.

The blurred background (depth of field) is related to three factors:

1, the larger the aperture (the smaller the aperture value f) and the shallower the depth of field, the smaller the aperture (the larger the aperture value f) and the deeper the depth of field.

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

3. The closer the subject is, the shallower the depth of field is, and the farther the subject is, the deeper the depth of field is.

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