Quote Originally Posted by marciofs View Post
There was a tape near the pinhole that was making this edge not circular.
But the problem is that the box is too narrow which places the filme too near the hole.

I am looking for a box which I can have 7x9in but I can't find any that will be deep enough to avoid vignetting. When I find it is too bit.

Maybe I will have to make a box with woods.
This happened to me. I spent too much time looking for the right box and then finally I just made one out of matboard. It seemed a little silly to be making a cardboard box, but once I sat down and went at it, it did not take very long and I ended up with what I wanted.