The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summicron-M 50mm f2 and the Leica Noctilux-M 50mm f0.95 ASPH for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Leica Noctilux-M 50mm f0.95 ASPH is the longer of the two lenses at 75mm. The Leica Summicron-M 50mm f2 with a length of 44mm, is 31mm shorter. Besides being longer, the Leica Noctilux-M 50mm f0.95 ASPH also has a larger diameter of 73mm compared to the Leica Summicron-M 50mm f2's 53mm diameter.
The 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 Summicron-M 50mm f2 weighs 240g, which means it is 460g (65%) lighter than the Leica Noctilux-M 50mm f0.95 ASPH which has a weight of 700g.
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 the Leica Summicron-M 50mm f2 and the Leica Noctilux-M 50mm f0.95 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.
Both lenses have the same focal range of 50mm but while Leica Summicron-M 50mm f2 has the fastest aperture of F2.0, the Leica Noctilux-M 50mm f0.95 ASPH's widest aperture value is F0.95.