Need Help on Filter Size....

[whitecat]

I have a 6 x 9 Zeiss Ikon 518/2 with 105mm Novar. Does someone know the filter size for this one?
Thanks

 

[Xmas]

Whitecat

Callipers?

Noel

 

[rogue_designer]

most of the Zeiss folders from that era fit 35.5 screw in, but I don't know about that particular lens.

 

[Xmas]

Whitecat

Ash different Nettar was 27mm, but Zeiss were not all that regular.

Noel