Hi Kenneth
Welcome to the forum.
Have a look at:
Leica Forum: Leica vs Canon zoomlens
- Vario-Elmar-R 28-70mm f3.5-4.5 (made by Sigma, Japan)
Leica Vario-Elmar-R F3.5/4.5 28-70 lens: Good? - Photo.net Leica and Rangefinders Forum
The first version of this lens (3-cam, pull-out hood, 1990) was made for Leica by Sigma and used Sigma's design and glass.
It was released along with the R-E body and for a time it was sold as a kit.
Leica Camera - Wikipedia, the free encyclopedia
Leica 28-70 mm f/3.5-f/4.5 Vario-Elmar-R zoom (Sigma design)
Hope this is some help.
Looking forward to see your pictures.
All the best,
Ruben