Depth of sharply depicted space (depth of field) is the distance between the closest and farthest object in the scene, which are perceived in the photo as sharp. Everything that lies closer or further than the depth of field zone is more or less blurred.
It should be understood that the concept of IPIG is quite arbitrary. There is no real and unambiguous depth of field in nature, since the lens at a time can be focused only on one specific distance, and not on some abstract range of distances. It is more appropriate to speak more about a focusing plane of infinitely small thickness, closer and further which the image begins to blur. Continue reading