Zeiss S-Planar and M-Planar 120mm

Hello to everyone,

I would like to find out what in detail are the differences between
the Zeiss S-Planar 5,6/120mm and the Zeiss M-Planar 5,6/120mm. From
what one can find easily is (blinkingly obvious) that they claim that
the M-Planar is optimized for Macro Photography but on the other hand,
they also say that the S-Planar is excellent for the same application.
Looking at both lenses, I do not see an obvious difference - is anyone
out there who is knowledgeable regarding their differences? I could
guess that both lenses are identical but the M-Planar is regarding
spacing and setting of the elements more optimized for macro than the
S-Planar..or is there any other known difference?
Thanks for your replies and suggestions -
Georg N.Nyman
.

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