Hi there, not long ago I replaced the screen on my Rolleiflex (3.5E, Xenotar 75/3.5) with a brilliant matte Hi lux maxwell screen. The screen is a very bright and a big improvement. I have the following questions: 1) The screen was installed for me by a technician who also adjusted the focus. How can I know the he put it in the right way - up side, down side wise? I understood that the bottom side should be completely matte and not reflecting light, and opaque. The upper side now reflects light and is bright. Is it OK? 2) The upper side is not completely smooth. I mean, not as smooth as glass. I becomes dirty very easily and not easily cleaned. Should it be so? Thank you for your answers.