Example of the measurements we need:
A(Height of the lens Board):98mm
B(Width of the lens board):96mm
C(Total Length of the lens front + back element): 34+24mm= 58mm
D(Inscription on the lid): Schneider G-Claron 240mm f/9
E(Thickness of the lens board):2mm
F(Length of the front lens el. including lens caps): 34mm
G(Length of the back lens el. including lens caps): 24mm
*Check product gallery for an example how to meter and make the calculations.