Voigtlander Nokton 40 f / 1.4 is a moderately priced lens of an interesting save length. Many photographer Consider 40mm to be a golden mean for any kind of photography, it Guarantees 100% natural perspective and a very useful angle of view.
The successful construction, valued by photographers for sharpness, good plasticity, and a very nice, light vignetting at f / 1.4. In this case vignetting is more a visual effect than a disadvantage, as it naturally puts emphasis in the center of the shot, and when the need to remove it comes, you have to stop the lens down a bit.
mount Leica M (Voigtlander VM)
Aperture: f / 1.4 (the minimum f / 16)
aperture blades 10
nearest distance: 0.7m angle
construction 7 elements in 6 groups