The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 50mm F1.5 and the Voigtlander 40mm F1.4 Nokton Classic for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Voigtlander 50mm F1.5 is the longer of the two lenses at 46mm. The Voigtlander 40mm F1.4 Nokton Classic with a length of 30mm is 16mm shorter. On the other hand, the Voigtlander 40mm F1.4 Nokton Classic has a larger diameter of 55mm compared to Voigtlander 50mm F1.5's 54mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Voigtlander 40mm F1.4 Nokton Classic weighs 175g, 40% (118g) lighter than the Voigtlander 50mm F1.5's weight of 293g.
Below you can find the dimension and weight table of the 'Standard Prime Lenses in Leica M Mount for size comparison purposes.
Standard Prime Lenses in Leica M Mount for Size Comparison
Both Voigtlander 50mm F1.5 and Voigtlander 40mm F1.4 Nokton Classic has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M11, Leica M10 and Leica M Typ 262.
Voigtlander 50mm F1.5 is a prime lens with fixed focal lenght of 50mm. Voigtlander 40mm F1.4 Nokton Classic is a prime lens with fixed focal lenght of 40mm.