Hello all,
I got this lens recently, it is a Berthiot Perigraphe no. 3 serie VI 120mm f/14.
Very short barrel with a wheel stop.
On close inspection I found some yellow transparent substance glued on the inside surface (close to the edges) of both front and rear groups.
I can be seen with the lens assembled and even thru the smallest stop. It is around 1mm wide, all around the edge on both groups, as if it had a purpose.
Should I use benzene to try to remove that? Or should I paint black over it?
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