Recently, Skyllaney Opto-Mechanics spoke with Hamish of 35mmc.com about our upcomming 5cm F/2 Bertele lens. The full interview can be found here:

https://www.35mmc.com/27/04/2020/bringing-a-new-m-mount-sonnar-lens-to-market-an-interview-with-chris-andreyo-skyllaney-opto-mechanics/

Dr. Ludwing Bertele (1900-1985)
Optical designer of the original Sonnar lenses
Bertele 3/4 Section View (1937 formula shown)

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