The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 21mm F4 Color Skopar II and the Carl Zeiss Biogon T2/35 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 T2/35 ZM is the longer of the two lenses at 68mm. The Voigtlander 21mm F4 Color Skopar II with a length of 25mm, is 43mm shorter. On the other hand, the Voigtlander 21mm F4 Color Skopar II has a larger diameter of 55mm compared to the Carl Zeiss Biogon T2/35 ZM's 52mm 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. Voigtlander 21mm F4 Color Skopar II weighs 136g, which means it is 104g (43%) lighter than the Carl Zeiss Biogon T2/35 ZM which has a weight of 240g.
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 Voigtlander 21mm F4 Color Skopar II has a filter size of 39mm whereas the Carl Zeiss Biogon T2/35 ZM has a 43mm 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 Voigtlander 21mm F4 Color Skopar II:
And these are the 43mm filters that we recommend for the Carl Zeiss Biogon T2/35 ZM:
Lens Mounts
Both the Voigtlander 21mm F4 Color Skopar II and the Carl Zeiss Biogon T2/35 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
Voigtlander 21mm F4 Color Skopar II is a prime lens with fixed focal lenght of 21mm.
On the other hand, the Carl Zeiss Biogon T2/35 ZM is a prime lens with fixed focal lenght of 35mm.