Rollei 35 uses this size as well as 30.5

24  >  30.5  Heliopan adapter #343...new stock...27.50 

24      Heliopan Rubber lens shade...n/o... 22.00

24  >  37 step-up ring...new stock...7.00

24      Hoya K2 yellow 8...n/o...9.50

24      Hoya G Orange16...n/o...9.50

24      Hoya X1 Green 11...n/o...9.50

24FR  Carl Zeiss Orange 21...n/o... 13.00

24FR  Carl Zeiss Yellow 8...n/o... 13.00

24FR  Carl Zeiss 80B...n/o... 9.50

24FR  > series 5 adapter...u/m...8.00