The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summarit-M 35mm f2.5 and the Carl Zeiss C Biogon T4,5/21 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 C Biogon T4,5/21 ZM is the longer of the two lenses at 56mm. The Leica Summarit-M 35mm f2.5 with a length of 34mm, is 22mm shorter. Besides being longer, the Carl Zeiss C Biogon T4,5/21 ZM also has a larger diameter of 53mm compared to the Leica Summarit-M 35mm f2.5's 51mm 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 C Biogon T4,5/21 ZM weighs 210g, 4% (10g) lighter than the Leica Summarit-M 35mm f2.5's weight of 220g.
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
The Leica Summarit-M 35mm f2.5 has a filter size of 39mm whereas the Carl Zeiss C Biogon T4,5/21 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 Summarit-M 35mm f2.5:
And these are the 46mm filters that we recommend for the Carl Zeiss C Biogon T4,5/21 ZM:
Lens Mounts
Both the Leica Summarit-M 35mm f2.5 and the Carl Zeiss C Biogon T4,5/21 ZM has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M EV1, Leica M11-D and Pixii Max.
Focal Range
Leica Summarit-M 35mm f2.5 is a prime lens with fixed focal lenght of 25-35mm.
On the other hand, the Carl Zeiss C Biogon T4,5/21 ZM is a prime lens with fixed focal lenght of 21mm.
