1/3 to 2/3 one is in front and the other behind the focal plane. I can't look it up right now, but --- Most of the older manual lenses have this print on them. -----Original Message----- >From: Jorj Takacs <jorj@xxxxxxxxxxxxxx> >Sent: Feb 3, 2010 11:26 AM >To: List for Photo/Imaging Educators - Professionals - Students <photoforum@xxxxxxxxxxxxxxxxxx> >Subject: Depth of Field question > >A simple question yet I cannot seem to find a simple answer. > >Why is there more DOF behind the point of focus than in front? > >Thanks in advance. > >Jorj >