![](http://img.photobucket.com/albums/v313/RiceHigh/Web Linking/DA14_Compo.png)
(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