The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Milvus 25mm F1.4 and the Sigma 20mm F1.4 DG HSM A 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 HSM A is the longer of the two lenses at 130mm. The Zeiss Milvus 25mm F1.4 with a length of 123mm, is 7mm shorter. On the other hand, the Zeiss Milvus 25mm F1.4 has a larger diameter of 95mm compared to the Sigma 20mm F1.4 DG HSM A's 91mm diameter.
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Below you can find a scaled side-by-side image of Zeiss Milvus 25mm F1.4 and Sigma 20mm F1.4 DG HSM A to get a better idea of how their sizes compare in real life.
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. Sigma 20mm F1.4 DG HSM A weighs 950g, 22% (275g) lighter than the Zeiss Milvus 25mm F1.4's weight of 1225g.
Lens Mounts
Both the Zeiss Milvus 25mm F1.4 and the Sigma 20mm F1.4 DG HSM A has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Zeiss Milvus 25mm F1.4 is also available in Canon EF mount.
Sigma 20mm F1.4 DG HSM A is also available in Canon EF , Sigma SA and Leica L mounts.
Focal Range
Zeiss Milvus 25mm F1.4 is a prime lens with fixed focal lenght of 25mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
37.5mm.
On the other hand, the Sigma 20mm F1.4 DG HSM 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 30mm.