They were made by Sigma. They had an agreement with the East German Carl Zeiss in the eighties, and made some lenses for them, 3 or 4 zooms and the 24 mm. you mention.
Sigma and MInolta also made some zoom lenses for Leitz, in the R (SLR) mount, sold under the Leica name, with Leica prices.
Carlos
Hmm..that's interesting. It _does_ look like a Sigma lens of that vintage. Not a great advertisement for Zeiss. But it was my first WA, and I've done a few interesting shots with it.
Thanks D
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