Originally posted by ioszhka I'm not 100% it's dust. It looks like dust when viewed directly, but when you look at it in an angle, it resembles waves in the glass binding agent. Sadly, I cannot take a good enough photo to illustrate the problem.
The lens is not mine, so there's not any cost related problems. The friend that gave it to me wanted for me to sell it and make some spare money (He doesn't own photographic equipment anymore).
I want to fix it, because, after seeing some photographs taken with it, I was surprised with their quality. Besides that, it has f/2.5 and can serve as a good portrait lens (I think it was used by my friend's dad for wedding photography).
while groups can be re glued, you are talking about very expensive work that goes far beyond what that lens is worth (unless like I said you can find repairs in a country where cost of labor ism very low). At least that is what I have been led to believe. That lens seems to be selling for over 100USD on ebay here which is high for an old manual focus lens. I'm betting it is a pretty good lens. If no one comes up with any recommendations, you might want to try and salvage it yourself. Does any of it show on photos and can you tell roughly where in the lens the damage is?