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Sigma APO AF 400/5,6
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PostPosted: Wed Oct 23, 2019 9:38 am    Post subject: Sigma APO AF 400/5,6 Reply with quote
Hi All,

Has somebody optical layout drawing or anything else for Sigma APO AF 400/5,6 (1988-1995) lens?
Thanks a lot.


PostPosted: Sat Oct 26, 2019 10:29 am    Post subject: Reply with quote
There are two versions, one from 1988 and a new model in 1994. The first is 11 elements in 8 groups with 2 ULD elements in the front group, with maximum reproduction ratio being 1:9.5. The latter is a macro lens reproducing up to 1:3 and has 10 elements in 7 groups with 2 'Special Low Dispersion' elements. Both use internal focusing and floating lens groups for high performance across the focusing range.

Unfortunately my own sources didn't have the diagrams either.
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