Archived posting to the Leica Users Group, 2000/11/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mark Rabiner <mark@rabiner.cncoffice.com> wrote: > If you fill the top to bottom of the chair with a 28mm it should give > you just as much front to back dof as when you pull way back across > the street and fill the chair top to bottom with a 90mm lens. > > But it doesn't'. Why should it be the same? DOF is based on aperture and distance from the lens. The larger the aperture opening, the larger the circles of confusion. Less DOF. The further from the lens, the less relative change in the size of the circles of confusion as you move the same absolute distance. More DOF. __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one Place. http://shopping.yahoo.com/