The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summilux-M 21mm f1.4 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 Summilux-M 21mm f1.4 Asph with a length of 66mm, is 9mm shorter. On the other hand, the Leica Summilux-M 21mm f1.4 Asph has a larger diameter of 70mm compared to the Carl Zeiss Biogon T2,8/21 ZM'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. Carl Zeiss Biogon T2,8/21 ZM weighs 280g, 51% (300g) lighter than the Leica Summilux-M 21mm f1.4 Asph's weight of 580g.
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
Lens Mounts
Both the Leica Summilux-M 21mm f1.4 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
Both lenses have the same focal range of
21mm but while Leica Summilux-M 21mm f1.4 Asph has the fastest aperture of
F1.4, the Carl Zeiss Biogon T2,8/21 ZM's widest aperture value is
F2.8.