"Sonnar Magic" is an appropriate term for this lens.
Symmetric lenses are easy to figure out how they work. Put two similar lenses back-to-back and they cancel out aberrations, like two prisms first splitting white light into a rainbow and then back to white light again.
After taking apart many Sonnar lenses, given the optical properties of making a Tele-Photo front end work with an achromat-
"Sonnar Magic" is appropriate. Light going through a Sonnar is in for a wild-ride.
Symmetric lenses are easy to figure out how they work. Put two similar lenses back-to-back and they cancel out aberrations, like two prisms first splitting white light into a rainbow and then back to white light again.
After taking apart many Sonnar lenses, given the optical properties of making a Tele-Photo front end work with an achromat-
"Sonnar Magic" is appropriate. Light going through a Sonnar is in for a wild-ride.