What is this ?

[Original katomi]

Have a look at where it folds and corners they are the most common places for light leaks(based on personal experience with a old Pentax k1000 compabale unit)

 

[IanG]

Leitz Focusing Bellows For R Mount Cameras 16860, that's definite

The scale rotates for different FL lenses, a nice set of bellows if you have a Leica SLR.

Ian

 

[compur]

Yes, it's the Leica Focusing Bellows R.

I missed the OP's post giving the mfr's name and that lever on the mount fooled me.

 

[IanG]

Yes, it's the Leica Focusing Bellows R.

I missed the OP's post giving the mfr's name and that lever on the mount fooled me.

I have a set of Exacta bellows but that lever puzzled me as it's on the wrong end.

Ian