Hi everybody! I promised a while back that I will report about my adventures with the Canon Ec-S matte screen. The Ec-S is canons Super precission matte for manuall focussing very fast lenses (their 85/1.2 for example). It has a very distinct POP when the image is in focus. I tried a lot of matte screens in my D700. First was the Canon Ec-L, cut to fit by focussingscreen.com. It was superb to work with but I didn't like the double cross prism. So I ordered a Nikon F6-J from them. The F6-J has a nice microprism, but the hexagon matte it uses is the horror. It is even more imprecise for MF than the D700 stock screen. Well I was a bit sad because none of the screens was what I wanted, but I considered buying another Ec-L. After browsing through some canon fora, I discovered the rather new Ec-S, but unfortunately, focussingscreen.com doesn't offer it. So I just bought a stock Canon screen, some sandpaper, and then the horror began I grinded it down to approx. the size of the stock screen. but I was a bit lazy and didn't grind away the plastic around the "nose". Bad Idea, it got stuck in the viewfinder chamber and it took me two days and a pin to remove it. thank god no harm was done to screen or camera. Well I grinded away more and now it fitted in better. But I had a bit of backfocus. So I grabbed a few shims, opened the cam again and argh, the screen was still pretty stiff to get it out, so I grinded away even more. Bad Idea. now the retaining spring doesn't hold the screen in place anymore. Luckily, I had a spare metal shim laying around that I put on top of the screen, so it fits between the screen and the retaining spring. The shim is 1 or 1,5mm in width, so it just covered the bit too much I sanded away. Hopefully it will stay put where it should be!! Well, moral of the story: it does work, but you have to be precise when grinding away. I thought I where, but it is really about 1/10th of a millimeter, so be careful. But then, the screen costs only € 20,-- so if you grind away too much, don't worry. If it doesn't stay put, I will grab another one. It is just that they are VERY rare and it took me 2 months to get mine (a week to find a dealer that offered it to me, 6 weeks for the delivery...). In practice, the screen is very nice to work with and I think this will be the one I will use for a long time with my lenses, especially the 200/2.8 Mamiya, where you need absolutely precise focus.