Viewfinder cases
thingiverse
Cases with lids for viewfinders: Voigtländer 12mm gen 1 (the one that looks like a TV - for the Leica thread mount version of the lens) Leitz / Leica 21mm SBKOO (12002) (for the Super Angulon 21/4 and 21/3,4 lenses, also for the Brooks Veriwide) Might fit other viewfinders, I dunno?
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