I'm interested in this subject too, though as an obligate contact printer I don't quite know *why* I care, given that I could probably get away with using meniscus lenses ground from expired bologna.

Petzvals I think I understand; people seem to use them for shallow DOF with that appealing "swirly" look and a low-contrast "looks like a really old photo" character. But there are other lenses where I know the name but don't know what's special about them.

As one example, what's the big exciting thing about "red dot" Artars?