The new bellows is keeping out the light from where it doesn't belong. However, I'm still having problems with framing and film scratching in the No.1 Kodak Series III. I'm also seeing some under-exposure, even though the shutter appears to be working perfectly. My thought is that the light transmission capabilities of the glass in some of these old Kodak lenses is poor compared to newer standards. Luckily, the big 6x9 negatives allow for a large margin of error.