p.5 #1Zeiss Milvus vital stats, compared with Otus, Classic, and C/Y
The Zeiss 100/2 MP in the now Classic ZF.2 mount definitely has a lot of focus breathing. For focus stacking it's probably better to keep the 100/2 MP lens set at one magnification and move the whole camera system on a macro sliding rail. I suspect they have not changed that in the Milvus mount, but this aspect of the redesigned lens remains to be reported by anyone as far as I know.
p.5 #2Zeiss Milvus vital stats, compared with Otus, Classic, and C/Y
Lee Saxon wrote: Steve Spencer wroteIf macro lenses don't extend, then the focal length shortens at close range. AFAIK, all macro lenses do one or the other.And the two I have experience with (105/2.8 Micro-Nikkor and Leica 100AME) do both.
My memory was incorrect, I have double-checked, and this is only true of the Nikon. They do both change focal length in addition to having significant barrel extension, but the Leica focal length actually increases!