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 Carl Zeiss C Sonnar T1,5/50 ZM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Carl Zeiss C Sonnar T1,5/50 ZM is the longer of the two lenses at 63mm. The Leica Summicron-M 50mm f2 with a length of 44mm, is 19mm shorter. Besides being longer, the Carl Zeiss C Sonnar T1,5/50 ZM also has a larger diameter of 56mm compared to the Leica Summicron-M 50mm f2's 53mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Leica Summicron-M 50mm f2 weighs 240g, which means it is 110g (31%) lighter than the Carl Zeiss C Sonnar T1,5/50 ZM which has a weight of 350g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Leica M Mount for size comparison purposes.
Standard Lenses in Leica M Mount for Size Comparison
Filter Threads
The Leica Summicron-M 50mm f2 has a filter size of 39mm whereas the Carl Zeiss C Sonnar T1,5/50 ZM has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 39mm filters that we recommend you to consider for the Leica Summicron-M 50mm f2:
And these are the 46mm filters that we recommend for the Carl Zeiss C Sonnar T1,5/50 ZM:
Lens Mounts
Both the Leica Summicron-M 50mm f2 and the Carl Zeiss C Sonnar T1,5/50 ZM has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M11 Monochrome, Leica M11 and Leica M10.
Focal Range
Both lenses have the same focal range of
50mm but while Leica Summicron-M 50mm f2 has the fastest aperture of
F2.0, the Carl Zeiss C Sonnar T1,5/50 ZM's widest aperture value is
F1.5.