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Depth of field is the distance between the farthest and closest objects in a photo that is relatively sharp and in focus. There are a number of factors that affect depth of field which are the Aperture, focal length, subject to camera distance, and camera sensor size.
Depth of field increases the viewer’s depth perception when viewing a two-dimensional projection of a three-dimensional scene, it also helps to give a unique touch of essence, creativity and perspective to your image. Depth of field, tilt, and shift capabilities of a large format camera such as a 4×5. The full-frame equivalent to the standard 4×5 lens (e.g., 210mm f/5.6) is a 56mm f/1.5 which may not sound like much but the fact of the matter is that most people would agree that there’s something particularly special to large-format images (particularly when it comes to portraits). When you start playing around with front standard movements, that already razor-thin depth of field can make some very creative looks.
The video below from Mat Marrash explains the four factors required for depth of field using a 4×5 lens and how it contributes to achieving depth of field.
