You asked
What are the alternatives to the voigtl nder heliar hyper wide 10mm f 5 6 aspherical?
I don't have a list of other lenses to suggest for the Voigtländer Heliar-Hyper Wide 10mm f/5.6 Aspherical. Its page covers the specs and the cameras it fits, but not comparable lenses, so I won't guess at model names.
If you want to look for an alternative, start with the gear catalogue and filter for your mount. This lens is made for Sony E and Leica M, so check those. The focal length guide explains what a very wide lens does to a scene, which helps if you're comparing focal lengths. The aperture guide is worth a look too. At f/5.6 this lens is fairly slow, so if you shoot in dim light, you'll want to compare maximum apertures as well as focal length.
Written by Claude from this site's pages.