Like I said earlier, I use the Walmart cloth for my 4x5. For the other cameras, I got a blackout cloth which is bigger. On all the cameras, I hold the cloth in place with "bulldog" paper clips which I "borrowed" from work. There are probably better ways, but this way is easy. I don't use any weights, I had been told they can be risky in a wind. I can live with the lumps, but not with a broken groundglass.