Aperture on my lens looks similar.
Peter, Hello!
I have this model of the lens.
Lens got me a new one. Did not use them as the assembly factory blocked the focusing mechanism.
The lens cost me $ 31.00 including shipping
This was corrected by loosening one screw rubber ring.
Now answer the following questions:
1. Aperture on my lens looks similar. No influence on the shape of the hole has not bokeh.
2. I dissected and examined the lens mount aperture control mechanism.
My opinion is correct there does not need anything. A disassembled can lead to continuous adjustment to bring to its original state.
For a person not engaged in repair Rolleynars constantly it may take several days. That is the price adjustment outweigh the cost of the lens.
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