How to shoot the background blur with SLR?

Taking Nikon D90 as an example, the background blur method of its SLR camera is as follows:

1. First load the 50 1.8D lens into the fuselage, and remember to turn on the D90 fuselage motor.

Then set the camera to the first gear.

3. Roll the front wheel on the front screen to adjust the aperture to 2.2 or 1.8, and then take optical photos; Note that the aperture of 1.8 is larger than that of 2.2.

4. Then use a telephoto lens to shoot the effect of blurring the background.

Single-lens reflex camera, also known as SLR camera, refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection. The so-called "single lens" means that the photographic exposure light path and the framing light path * * * use one lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens. "Reflection" means that the plane mirror in the camera separates the two optical paths. The first SLR camera was developed by 1909. Since 1970s, this technology has been widely used, and SLR cameras have become the new favorites of senior photographers and professional photographers.