My Letter from Ilford chairman

[Dave Parker]

Know exactly what your are describing Curt, and that is really strange. Can not think of any reason to do that unless they used it somehow to line up the lens...strange.

The only thing I can think of, was someone was trying to make their own clear center spot focusing spot, I have actually had a few ask if I can do this..

Dave

 

[David A. Goldfarb]

My 11x14" groundglass has a couple of these clear spots, in the center and toward the corner. They let you focus on the aerial image.