Archived posting to the Leica Users Group, 1998/11/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Carsten, Thanks for the explanation. It does sound plausible, but...how is contrast then measured for the purpose of those graphs? If I look at graph no. 1 in the Schneider paper at http://www.schneideroptics.com/quality/quality.htm , it appears that MTF is equal to how much of the line pairs is reproduced by the lens and can never be above 100%. Nathan Carsten Bockermann wrote: > Nathan, > > >>How can a lens transmit MORE information than is in the actual image?<< > > the MTF curve being above 100% doesn´t mean there is more information on > the film than in the actual image. Remember the y-axis denotes relative > contrast, so a value above 100% means that the contrast of the slide is > higher than that of the original scene. The MTF curves of high-contrast > repro film (no grey values, just black and white) must be very extreme in > this respect. > > Carsten > > http://ourworld.compuserve.com/homepages/Carsten_Bockermann/ - -- Nathan Wajsman Overijse, Belgium Photography page: http://members.tripod.com/~belgiangator/index.html Motorcycle page: http://www.geocities.com/motorcity/downs/1704/index.html