Hi all I got from ebay two Konica GRII lenses a while ago and have on booth of them dirt somewhere inside the backelements. So I cleaned all outside parts and also between the front and backelement. Then I tested the lenses re sharpness and the 260mm performed okay even with the schmutz inside the back element. The 210mm was worser then the 260mm but has lesser dirt in the back element then the 260mm. So now I got a G-Glaron 240mm wich has a tiny bit lesser dirt inside the back element but also a small amount of it! Is this normal with reprolenses or did I only have no luck with them! From what could this dirt be? Did you had similar experience with reprolenses?