Greetings, I have received a Linhof 4x5 fresnel screen for my MT 2000. The groove side of the fresnel is to be interfaced with the photographer side of the groundglass. The two sides of the fresnel look similar so it's difficult to tell which side is the groove side. The perimeter area around the border on one side is larger than the one on the other side though. Is the side with the larger border the groove side ? Many thanks.
lphong (new to large format)