Design and Construction of the DA14/2.8 - Leitz Lens Patent, Schott Glass (Not Hoya's)..

Someone at the DCHome.net has discovered that the Pentax DA14/2.8 lens (designed by: Mr. Hirakawa, Jun / 平川 纯) is adopting a Leitz LAK9 lens (element) patent and actually using Schott glass material, but not Hoya's own:-


(Source: http://pentaxstudy.bufsiz.jp/Lensdesign/DA14/DA14_Design.htm)

Quite Interesting.. :-)


Further Technical References:-

Schott LAK9 General Technical Information

Schott LAK9 Refractive Indices and Spectra Response


Related:-

The Very Different Fates of Two ex-AOC Top Optical Engineers