Quote Originally Posted by Tom Hoskinson
The classic Zeiss Sonnar design is 5 elements in 4 groups.
Hmmm!!!! Your diagram of the Zeiss Sonnar doesn't look like MY diagram of the Zeiss Sonnar!!

One way to resolve this ... It is late tonight - 0041 hours. Tomorrow, I'll check out the Hasselbald lens catalog in my darkroom, and see what the Hasselblad Zeiss Sonnar looks like.