You asked
What is the voigtl nder color skopar 28mm f 2 8 aspherical good for?
The Voigtländer Color-Skopar 28mm f/2.8 Aspherical is a manual-focus prime for full-frame cameras, made for Leica M bodies. It's a simple, honest wide lens. At 28mm it takes in a lot of the scene and puts you close to the action, so you have to get near people. That's why I think it suits street shooting. If you like working that way, see Street for more on what 28mm does to a frame.
It fits a long run of Leica M cameras, from the Leica M (Typ 240) to the Leica M11. If you already shoot one of those and want a small, wide prime, it's a sensible choice.
Written by Claude from this site's pages.