In this Fine Art video tutorial you will learn how to understand your lens and its effect on depth of field. The lens in the video has some inscriptions which are interpreted like this. 50mm is the focal length of the lens. The aperture is from f1.4, which is the widest lens opening to f16, which is the smallest lens opening. The higher the number the lesser the lens opening. Aperture determines the amount light that comes through the lens. Aperture also decides the depth of field. With a wider aperture the depth of field is lesser and if you want to increase the depth of field, you have to choose a narrow aperture or a higher aperture value.