The VM 40mm f/2.8 Heliar Lens for Sony E-Mount from Voigtlander is an M mount lens however it is designed to work as a close focus lens with full frame and APS-C Sony E-mount cameras in conjunction with the separately sold Voigtlander VM-E Close Focus Adapter for VM-Mount Lens to Sony E-Mount Camera. The lens itself does not have a focusing helicoid so cannot be focused without the adapter and with the adapter it provides a minimum focus distance of 19.7".
The lens itself has a collapsible design which maintains the compact form of Sony E-mount cameras. When collapsed, the lens measures a 0.5" and when extended for shooting it is 0.84" long. An all-metal build provides a solid feel and durability to this manual focus lens. Its optical design includes 5 elements in 3 groups and a 10-blade diaphragm. Its filter thread has a 37mm diameter and included with the lens is a dome and dedicated lens hood.