Guest-edited by Pascal Martin

Depth of field can be defined as the zone of tolerance in which the eye cannot distinguish between sharpness and blurriness. In other words, it is nothing other than a blurry space which is seen as being sharp. Focusing, which has an essential function in cinema, is thus just as much a matter of perception as it is of image recording technology. The theoretical and practical consequences of this fact will be explored here from both a scholarly and a practical point of view. Questions around filming conditions will be examined in relation to measuring depth of field and the aesthetic aspects associated with these technical and perceptive variables.