He started by making a cardboard first prototype with a found lens from 1890. After getting a lot of NO from many french 3D printers he met Arnault Coulet, CEO of a French 3D printing agency called FABULOUS. His team and he designed the 3D prototype and printed the lens. Luckyly for us, he saw [ ]
http://3dprintingchannel.com/3d-printing-videos-what-can-you-photograph-with-a-3d-printing-camera-lens/