Archived posting to the Leica Users Group, 1998/05/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henning Wulff explained: >Achromats are lenses which are corrected for longitudinal chromatic >aberrations to bring two colors in the visible spectrum to the same focal >plane, whether they have 2 elements or a dozen. True, but I've seen the Telyt/Elpro formula called an "achromatic pair". I think because it was the first lens type to reach achromatic (2 color) correction. This does confuse the terminology somewhat. Nick Hunter