Voigtlander's compact M-mount normal — 40mm f/2.8 Heliar in near-pancake dimensions.
The Voigtlander Heliar 40mm f/2.8 is a compact standard prime from Voigtlander's VM series for Leica M-mount cameras using the classic Heliar optical formula. 40mm on full-frame provides a moderately narrow standard field of view, between the common 35mm and 50mm M-mount options. VM = Voigtlander M-mount (Leica M bayonet). Leica M mount.
f/2.8 maximum aperture. 40mm focal length (full-frame). Heliar optical formula. Manual focus with rangefinder coupling. At approximately 175g. 46mm filter thread. Leica M mount.
The Heliar formula dates to 1900 (Peter Voigtlander's original design) and is known for smooth rendering. At 175g and 46mm filter thread, this is an unusually compact and lightweight M-mount prime. The 40mm focal length is a less common choice between 35mm and 50mm, providing a slightly tighter standard view.
On the used market the Voigtlander Heliar 40mm f/2.8 VM is a compact and affordable M-mount standard prime. Condition checks: 46mm front element (small — inspect closely for marks), focus ring damping, rangefinder coupling accuracy. Leica M mount — manual focus.