I just picked up a Kodak 2D 8x10 camera and I'm wondering about some issues with the ground glass that was included. The ground glass looks homemade with pencil drawn grid lines and slightly sloppy corner cuts, but the big issue is the evenness of illumination. The lens on the camera is huge-- a Schneider Symmar S 240mm f/5.6, so I feel like I should be getting a nice bright image on the ground glass, but the image is a little dimmer than I'd expect and there's a terrible hot spot problem. The ground glass shows a hot spot on axis with each of my eyes so much that it gives me a headache to look at the ground glass with both eyes open. Does this seem like a poorly made ground glass issue? Do I need a fresnel for the slightly wide 240mm? I have no experience with 8x10, so I'm not sure what to expect, but I'm assuming this isn't normal.