Archived posting to the Leica Users Group, 2000/05/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- -- On Tue, 16 May 2000 23:19:26 Henning J. Wulff wrote: >At 3:01 PM -1100 5/16/00, Takeshi Hashimoto wrote: >> >>Check the MTF curves for both the film and the lenses. You'll note that >>the response for each peaks at 5-15 lp/mm, and each, of course, is higher >>than any competitors at that level. >> >>In other words, what makes Leica lenses so noticeably sharp is their >>superb contrast transfer function at the 5-15 lp/mm region. >> >>Kodachrome 25 also happens to excel in this region, and has the highest >>visible sharpness of any film (for that reason). High contrast above about >>25-30 lp/mm is not as important (actually, it's quite useless) for human >>perception of clarity and sharpness. >> >>Some other brands of lenses and films have higher transfer functions in >>that region (above 25-30 lp/mm) but none has equaled the Leica/Kodachrome >>25 juggernaut. >> > >The main reason for Kodachromes high apparent sharpness and great MTF >performance in that region (even 64 and 200) compared with films capable of >higher resolution and with finer grain is the high acutance of the films, a >factor that makes Cibachromes (sorry, Ilfochromes) from Kodachrome a whole >'nuther world than from E6 films. Maybe Kodak's first developer in K14 is >Rodinal ;-). According to Kodak,it's phenidone-based. Get your FREE Email at http://mailcity.lycos.com Get your PERSONALIZED START PAGE at http://my.lycos.com