Poor Flektogon

I bought a Flektogon in "very good condition". Inside I found this dull lens.

It's a group of two cemented lenses and the damage seems to be between them.

Anyway I cound not clean it.

So I made an "aperture" that covers the damaged area of the lens.

The modification costs about half an f-stop brightness and sometimes a bit

strange bokeh. Apart from that the image quality is entirely satisfying.

 

Done