Archived posting to the Leica Users Group, 1999/07/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Well - actually there is one more variable that visibly affects depth of field: curvature of field, and to be on topic - the old 35mm Summilux supposedly has lots of it. All the best! Raimo Photos at http://personal.inet.fi/private/raimo.korhonen - ---------- > From: Jim Brick <jimbrick@photoaccess.com> > Subject: [Leica] Re: Re: DOF? > > None of my (or any one else's) DOF charts and/or computer DOF programs have > a parameter for lens design, lens manufacturer, aberrations, or any thing > other than the focal length, at what distance focused, and the f/stop. So > you may be correct, but it is not a parameter that photographers think > about or have to deal with. The fringes of any DOF area is marginal anyway. > I doubt that a lens artifact is going to push things way out to the point > that the focal length DOF charts should be considered incorrect. The single > variable that a photographer has to think about is... what is my acceptable > circle of confusion. From that, the focal length, the focus distance or > magnification, and the f/stop, useful DOF can be computed. > > Now if the lens is just plain crappy, none of this is relevant. Nothing is > really in focus. It is at the fringes all of the time. DOF goes from crappy > to really crappy. Get another lens. Or use it for Bokeh only photographs. > > Jim >