The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20mm F1.4 DG DN A 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. Sigma 20mm F1.4 DG DN A is the longer of the two lenses at 111mm. The Carl Zeiss Biogon T2/35 ZM with a length of 68mm, is 43mm shorter. Besides being longer, the Sigma 20mm F1.4 DG DN A also has a larger diameter of 88mm 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. Carl Zeiss Biogon T2/35 ZM weighs 240g, 62% (395g) lighter than the Sigma 20mm F1.4 DG DN A's weight of 635g.
Filter Threads
The Sigma 20mm F1.4 DG DN A has a filter size of 82mm 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 82mm filters that we recommend you to consider for the Sigma 20mm F1.4 DG DN A:
And these are the 43mm filters that we recommend for the Carl Zeiss Biogon T2/35 ZM:
Lens Mounts
The Sigma 20mm F1.4 DG DN A has the Leica L lens mount whereas the Carl Zeiss Biogon T2/35 ZM has the Leica M lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Leica M EV1, Leica M11-D and Pixii Max for the Leica M Mount.
Sigma 20mm F1.4 DG DN A is also available in the Sony E mount.
Focal Range
Sigma 20mm F1.4 DG DN A is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36mm.
On the other hand, the Carl Zeiss Biogon T2/35 ZM is a prime lens with fixed focal lenght of 35mm.
