The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 21mm F1.8 Ultron and the Leica Elmar-M 24mm f3.8 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.Voigtlander 21mm F1.8 Ultron is the longer of the two lenses at 92mm. The Leica Elmar-M 24mm f3.8 ASPH with a length of 53mm is 39mm shorter. Besides being longer, the Voigtlander 21mm F1.8 Ultron also has a larger diameter of 62mm compared to Leica Elmar-M 24mm f3.8 ASPH's 41mm 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. Leica Elmar-M 24mm f3.8 ASPH weighs 260g, 36% (152g) lighter than the Voigtlander 21mm F1.8 Ultron's weight of 412g.
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 21mm F1.8 Ultron and Leica Elmar-M 24mm f3.8 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 21mm F1.8 Ultron is a prime lens with fixed focal lenght of 21mm. Leica Elmar-M 24mm f3.8 ASPH is a prime lens with fixed focal lenght of 24mm.