The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Elmar-M 24mm f3.8 ASPH and the Carl Zeiss Biogon T2,8/21 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 Biogon T2,8/21 ZM is the longer of the two lenses at 75mm. The Leica Elmar-M 24mm f3.8 ASPH with a length of 53mm, is 22mm shorter. Besides being longer, the Carl Zeiss Biogon T2,8/21 ZM also has a larger diameter of 53mm compared to the Leica Elmar-M 24mm f3.8 ASPH's 41mm 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 Elmar-M 24mm f3.8 ASPH weighs 260g, which means it is 20g (7%) lighter than the Carl Zeiss Biogon T2,8/21 ZM which has a weight of 280g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Leica M Mount for size comparison purposes.
Wideangle Lenses in Leica M Mount for Size Comparison
Filter Threads
Both the Leica Elmar-M 24mm f3.8 ASPH and the Carl Zeiss Biogon T2,8/21 ZM have the same Filter thread size of 46mm.
Below are links to the 46mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Leica Elmar-M 24mm f3.8 ASPH and the Carl Zeiss Biogon T2,8/21 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
Leica Elmar-M 24mm f3.8 ASPH is a prime lens with fixed focal lenght of 24mm.
On the other hand, the Carl Zeiss Biogon T2,8/21 ZM is a prime lens with fixed focal lenght of 21mm.