What lens is used to blur the background for a novice photographer?

When shooting, you should blur the background, choose a lens with large aperture or long focal length, and it is best to have a lens with both large aperture and long focal length.

Because, to blur the background, the essence is to make the depth of field shallow, so that the main part can achieve a clear effect in the depth of field, and the background part can achieve a blurred effect outside the depth of field. Moreover, the farther the background is from the depth of field, the better the blur effect is.

Three factors affect the depth of field: aperture size, focal length and focal length.

The larger the aperture (the smaller the aperture value), the shallower the depth of field, the longer the focal length, the shallower the depth of field, and the closer the focusing distance, the shallower the depth of field.

So, to blur the background, make the above choice on the lens. You can pay attention to the factor of focus distance when shooting.