Zeiss Flektogon aperture issue

Hi,

I have a weird issue with the aperture blades in my Flekrogon lens (P6 mount). When I rutn the aperture ring, there is no problem, but when I push the little pin in the back of the lens in, and let ho, the aperture blades stay open. With a bit of pushing in and out the blades will move again, but it's strange. Moreso because the blades work perfectly when turning the ring. There is no oil or other stuff visible on the blades.

What could be the problem? And the solution?

Thanks!

If there's no oil on the blades then my best guess is dried up grease and dirt on the springs and levers linked to the aperture. You may be able to remove some parts on the rear to access those.

When you let go of the aperture pin, does the pin spring back strongly, even when the blades don't move? I had a Mir-26B 45mm f/3.5 with an aperture pin that was unreliable. I sent it for CLA, the problem returned after a few years.

It's most likely oil even though you can't see it. It's a common issue with the P6 lenses. At any rate the solution is to open up the lens to see what's going on. I think there are some tutorials online.

As previous message says, I think that’s the case. I have two of these in the workbench queue so at the moment I can’t give any tip how to get there…

I juist had contact with a company in Germany that can do a full service on the lens for 95 euro + 19% tax and kosts for sending the lens. I'm wondering if it's worth it. I bought this lens for 130 euros.

I think the price is fair for a full service.