>>3654168Where did the 105mm f2.5 is a sonnar design meme come from?
The closest zeiss sonnar design I could find (there's a bunch, sonnar is really more of a brand name) is 5 elements in 5 groups. The 105/2.5 is 5 elements in 4 groups, but the curvatures of the elements are very different.
The Nikkor 105mm f2.5 is a stellar lens though. I have one and I love it.