I plan on using my gf1 mainly with the 20mm lens attached and would like an optical viewfinder for composition. I give big bonus points for retro style and cheap price. The FOV doesn't need to be exact. I assume once I get used to it and compare my results to what I see through the finder, I'll know what is being cropped or how much extra will be in the picture. Does anyone use one? I'd love to see photos of your rig. What are you using and where did you find it?