"brian" wrote in message
m...

Symmetry alone can achieve perfect lateral color correction at 1:1 in
a lens which is not even achromatic. The DIN spec is nonsense, and
would not be acceptable to anyone I know in the lens design/optics
community.

Brian
www.caldwellphotographic.com

Now I'm really confused. When you say 1:1, do you mean original image size
to rendered film image size? If that's what you mean, how would that apply
to general LF photography?