Archived posting to the Leica Users Group, 2005/02/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I heard it from the mouth of Leitz, at Photokina, the year it was introduced. JB At 12:26 AM 2/11/2005, Frank Dernie wrote: >AFAIK there is no such thing as "APO glass". To get APO performance a >combination of elements of differing characteristics and curvature is >required to cancel the fact that different colours diffract differently. >The unusual partial dispersion glasses which this requires in at least one >element are very expensive. Whether the 350 actually has these is >debatable. The fact that it is v. sharp is well documented >Frank > > >On 11 Feb, 2005, at 01:30, SEUNG MIN LEE wrote: > >I have never heard that it had APO glass