The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 12mm F5.6 and the Leica Elmarit-M 21mm f2.8 ASPH for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Leica Elmarit-M 21mm f2.8 ASPH is the longer of the two lenses at 46mm. The Voigtlander 12mm F5.6 with a length of 43mm is 3mm shorter. On the other hand, the Voigtlander 12mm F5.6 has a larger diameter of 75mm compared to Leica Elmarit-M 21mm f2.8 ASPH's 58mm 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 12mm F5.6 weighs 230g, which means it is 70g (23%) lighter than the Leica Elmarit-M 21mm f2.8 ASPH which has a weight of 300g.
Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Leica M Mount for size comparison purposes.
Wideangle Prime Lenses in Leica M Mount for Size Comparison
Lens Mounts
Both Voigtlander 12mm F5.6 and Leica Elmarit-M 21mm f2.8 ASPH 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.
Focal Range
Voigtlander 12mm F5.6 is a prime lens with fixed focal lenght of 12mm. Leica Elmarit-M 21mm f2.8 ASPH is a prime lens with fixed focal lenght of 21mm.