The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 15mm F4.5 and the Voigtlander 12mm F5.6 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 12mm F5.6 is the longer of the two lenses at 43mm. The Voigtlander 15mm F4.5 with a length of 38mm is 5mm shorter. Besides being longer, the Voigtlander 12mm F5.6 also has a larger diameter of 75mm compared to Voigtlander 15mm F4.5's 59mm 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 15mm F4.5 weighs 156g, which means it is 74g (32%) lighter than the Voigtlander 12mm F5.6 which has a weight of 230g.
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
Both Voigtlander 15mm F4.5 and Voigtlander 12mm F5.6 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 15mm F4.5 is a prime lens with fixed focal lenght of 15mm. Voigtlander 12mm F5.6 is a prime lens with fixed focal lenght of 12mm.