![](https://www.thefisheyelist.com/wp/wp-content/uploads/2021/02/s-l1600-12.jpg)
Known to have been on the market till 1998. It’s part of that era Sigma used a kind of opaque and smooth rubber-like coating on its lenses. That coating easily degrades into a sticky slime, so perfect samples are rare and almost impossible to find.
photo: courtesy of Team-Foto