A lens with a focal length range is usually called a portrait lens.

Generally speaking, people understand a lens with a medium focal length as a portrait lens.

The so-called medium focus lens is generally understood as a lens with a focal length of about 50 mm The imaging angle of the lens with this focal length is closest to the human eye, so the portrait looks most comfortable. That's why the term "avatar" is used.

But in fact, the focus range of portrait lens is much wider. ...

In fact, from 35mm to 200mm, this large range of focal length can be used to shoot portraits, and the lens with this focal length can be called "portrait head" ...

For example, 35F 1.4

Such as 50F 1.4 and 50F 1.2.

For example, 85F 1.2 and 85F 1.4.

For example, 105F 1.4

For example, 135F2, 135F 1.4.

For example, 200F2…… .............................. Although the focal length of this lens is really long, but people call it "air cutting machine", and the portraits taken are sharp and beautiful!

Even a 100 micro lens can be regarded as a portrait head. ...

The lens mentioned above, in fact, also includes the lenses of other specifications within this focal length range, all of which are portrait heads with outstanding portrait shooting effect.

As for which lens to choose as a portrait, there is no fixed number ... everything depends on your own preferences ...