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Manual Focus Lenses Forum

Explore the world of vintage lenses through repair notes, real test shots, and detailed archive threads packed with images.

Explore the world of vintage lenses through repair notes, real test shots, and detailed archive threads packed with images.
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Sigma APO AF 400/5,6
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Posted: Wed Oct 23, 2019 9:38 am
Post subject: Sigma APO AF 400/5,6
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Posted: Wed Oct 23, 2019 9:38 am
Post subject: Sigma APO AF 400/5,6
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Hi All,

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


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Posted: Sat Oct 26, 2019 10:29 am
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Posted: Sat Oct 26, 2019 10:29 am
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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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