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 APO 50mm f2 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 APO 50mm f2 ASPH is the longer of the two lenses at 47mm. The Leica Summicron-M 50mm f2 with a length of 44mm is 3mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 53mm.
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 60g (19%) lighter than the Leica APO 50mm f2 ASPH which has a weight of 300g.
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
Lens Mounts
Both Leica Summicron-M 50mm f2 and Leica APO 50mm f2 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
Both lenses have the same focal range of 50mm and the fastest aperture of F2.0.