Voigtländer M Heliar 40/2.8

Pancake lens for Sony E
 
Focal Length 40 mm
Aperture Ratio 1:2,8
Minimum Aperture F 22
Lens Construction 5 elements in 3 groups
Angle of View 57?
Aperture Blades 10
Minimum Focus No Focusing Helicoid in this lens itself, (0.5m when using with VM-E Close Focus Adapter)
Maximum Diameter 52 mm
Length 21.4mm : expanded, 12.6mm : collapsed
Mount M-Bajonett (VM)
Weight 132 g
Filter Size 37 mm
Color nickel
Others Collapsible. Standard lens hood regular: silver, Dome: black
Optional ---