Voigtlander's ultra-wide for various mounts — 15mm f/4.5 Heliar Mark III, non-VM version.
The Voigtlander 15mm f/4.5 Super Wide Heliar Aspherical III appears to be a non-VM (non-M-mount) version of the 15mm f/4.5 Heliar — possibly for Sony FE or another mount. Check mount designation against IDs 690 and 1728.
Same optical formula — 15mm at f/4.5 with aspherical correction. The Mark III improved edge performance on high-resolution sensors. The filter thread accepting standard screw-on filters at 15mm is the standout practical feature.
Various mount options. Filter thread accepts standard filters. Very compact and lightweight at approximately 198g. Manual focus with electronic contacts on electronic-mount versions. Full-frame coverage.
Check against IDs 690 and 1728 for mount variant or duplicate. Available used at mid-range prices. The filter capability at 15mm is genuinely useful for landscape ND and polariser work. See earlier entries for full details.