I've recently acquired a Century 5x7 view camera, and in the process of getting it ready for use, decided to take out the ground glass screen to clean off some dust and accumulated grime. I noticed that the screen had been mounted with the ground surface facing toward the photographer, and the smooth side of the glass facing inside the camera. After a successful clean (a rubber eraser gets rid of unwanted pencil-drawn grid marks- I prefer a clear uncluttered image on the ground glass) and a gentle wash in warm soapy water, I am now unsure as to which way to re-install it in the camera! All previous LF cameras I have used have had the ground surface facing the photographer, so I'm wondering: a) does it really matter? b) perhaps the previous user of the camera mounted it the wrong way round by mistake? c) as the camera has been modified with two aluminium strips along the length of the springback (to shift focus back a couple of mm to account for the thickness of modern darkslides, according to the previous user) perhaps reversing the GG was part of this modification? Your experienced thoughts would be much appreciated!