So you want to get the most out of the creative side of photography and want to learn how to control depth of field like a pro?
Before setting off, you have to understand what feature of the camera we use to control depth of field and that is the aperture of your lens. In basic terms, a wide-open aperture such as F4 will give you a shallower depth of field as opposed to a small aperture opening such as F22, however, there are many other factors that influence how sharp the foreground and background of your subject is.
The first factor is indeed the aperture setting as mentioned above, the wider the aperture the shallower the depth of field will be and vice versa.
The second factor is the focal length of your lens. The greater the focal length the shallower the depth of field will be regardless of the aperture setting used.
The third factor is the physical depth in the composition. If you have your subject right up against a wall, there will be no depth of field as you need separation between the subject and its background.
Lastly, you have to take into consideration the distance from the camera to the subject. The closer the camera to the subject, the shallower the depth of field.
Take a look at the video below by the YouTube channel: Run N Gun on 3 Elements Of Smoother, Shallower, Cinematic Depth Of Field...