The object distance determines the perspective, and the perspective is different when the object distance is different at the same magnification under different viewing angles.

So we should see that the SLR of LZ is half width and full width (the equivalent focal length of half width should be multiplied by the conversion factor).

1. A super wide-angle lens equivalent to 12-24mm, suitable for shooting environmental portraits.

And it can make people taller, legs longer and face thinner at a certain angle. For example, Casio's selfie artifact is equivalent to 2 1mm, which takes advantage of this.

2. The lens equivalent to 35-50mm is suitable for shooting humanistic realistic subjects, which has a three-dimensional sense and a sense of scene.

3. The lens equivalent to 85- 135mm is suitable for bust shooting, because the perspective of human facial features is the most accurate, which will neither enlarge the nose like a wide angle nor flatten the face like a telephoto.

So in fact, any lens can take portraits, but the 85- 135mm lens is the most natural, so it is the easiest to be named portrait lens. In fact, this focal length lens is called a portrait lens in New Zealand.