Back To Hexanon. Bringing It All Back Home returns to the theme of the budget 28mm — this exploring the neglected world of Konica's legendary Hexanon lenses. Discussed on this episde: the compact 4th version of the Hexanon AR 28mm 3.5 lens. Also: Hexanon 40mm 1.8, Hexanon 50mm 1.7. Links:

http://www.konicafiles.com/3-hexanon-ar-lenses/-wide-angle-lenses/ 

https://buhla.de/Foto/Konica/Objektive/e28_35.html