Hi Igor: I had Bill Maxwell process one of my screens with his "Hi Lux" process a couple of years ago. It really improved the focusing on my 45-90 lens and even made possible focusing the 125-250 indoors. The cost was about $100 & for me it was a better option than replacing the screen. He said at the time he had a couple of ETRsi screens available for purchase. I don't have his phone# but do a search on photo.net.