Voigtländer Filtre G2 49S 49mm 49 MM Ar 302/49 IN Jaune Filetage Femelle Nokton
The 302/49 fits the f2.0 ultron and the f1.5 nokton. The 310/49 lens shade screws into the filter and also can be screwed into either lens with our without filter.
Voigtlander Metal Hood 310/47 for Nokton 50mm f/1.5 + G2 Filter 302/49