I love using my Graphic handheld with RF, but I only have a cam for my 135mm lens. I'm forced to use the groundglass with my 90mm and it's really dim. I'd like to make a cam myself, but don't have the dimensions. Does anybody have one that they can lay on a flatbed scanner next to a ruler and post a scan? My particular lens is the Optar 90mm f/6.8, although I would think any cam designed for FL's within a few mm's should be close enough because of the DOF with this lens. Thanks!