The Heliar 40mm F2.8 is designed only to be used with Voigtlander VM-E Close Focus Adapter. It does not have built-in helicoid. Focusing is done by rotating the helicoid of VM-E Close Focus Adapter. Super compact style when the lens is collapsed.

Focal Length : 40mm
Maximum Aperture : 1:2.8
Minimum Aperture : F22
Lens Construction : 3 Groups 5 Elements
Angle of View : 57°
Aperture Blades : 10
Minimum Focus : 0.5m
  when using with VM-E Close Focus Adapter
Maximum Diameter : φ52mm
Length : (extended)21.4mm (collapsed)12.6mm
Weight : 132g(whithout hood)
Filter Size : φ37mm
Mount : VM mount
Hood : Straight type/Dome type with hood caps

The Heliar 40mm F2.8 is manufactured only for the purpose of using this lens onto E-mount camera body via VM-E Close Focus Adapter. You can not do focusing when you mount this lens via adapters not designed with built-in focusing-function or M-mount camera body directly. If you collapse the lens on M-mount camera body, it might result in damage the equipment. Any claims or damages due to improper use of this lens, which it was not designed for, are not covered by the warranty.







How to use Voigtlander VM-E Close Focus Adapter by Mr Tom Abrahamsson.