Voigtlander's M-mount ultra-wide — same as ID 690, 15mm f/4.5 Heliar for Leica rangefinders.
The Voigtlander 15mm f/4.5 Heliar Aspherical III VM appears to be the M-mount version of the lens listed as ID 690 (Sony FE version). The VM designation confirms Leica M-mount. Check for mount variant vs duplicate.
Same optical formula — 15mm at f/4.5 with aspherical correction and minimal distortion. The VM indicates Leica M-mount with rangefinder coupling. The Mark III improved edge performance on high-resolution digital sensors.
Leica M mount with 58mm filter thread — accepts standard filters at 15mm. Very compact and lightweight. Manual focus with rangefinder coupling. Electronic contacts on some versions for digital M communication.
Check against ID 690 for mount variant. The M-mount version works natively on Leica M cameras. Available used at mid-range prices. For Leica M shooters wanting compact ultra-wide with standard filter capability.