Archived posting to the Leica Users Group, 2005/02/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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