The Yongnuo YN 85mm f/1.8 is a fast portrait lens with a 85mm fixed focal point for Canon EF 35mm SLR cameras.
It is a copy of the original Canon EF85 f/1.8 lens.
Although stated in in the specifications that the minimal aperture is f/16 it is actual f/18 but that aperture was not selectable.
It is a very good lens for the picture quality you get. The only downside is the slow and noisy motor. So focus on the subject isn't that quick as it's Canon counterpart. Maybe not a good choice for video because of the noisy motor and the slow autofocus.
But if you are looking for an affordable portrait lens which gives outstanding picture quality, than this lens is a very good option.
Practical uses for this lens:
Portrait - photography
Product - photography