Archived posting to the Leica Users Group, 1999/06/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]"Richard J. Wyble" wrote: > > My question therefore seems to be how does one calculate or even > estimate just what that "as much infront of 'infinity' as possible" > might really be? > I don't know the maths, but a rule of thumb is that if you have a depth of field spanning X feet with a certain aperture when focused at a point Y, then 1/3 of X is going to be in front of Y and 2/3 is going to be behind it. So, the hyperfocal distance is the distance Y at which infinity is placed just at the very edge of the 2/3 zone for any given aperture. M. - -- Martin Howard, Grad. Schl. for Human-Machine Interaction, | HMI/IKP, Linkoping University, SE-581 83 Linkoping, Sweden.| Just Tel: +46 13 28 5741; Fax: +46 28 2579; ICQ: 354739 | say "DOOH" E-mail: marho@ikp.liu.se; www.iav.ikp.liu.se/staff/marho/ +------------