The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 14mm F1.4 DG DN and the Tamron 20mm F2.8 Di III OSD M1:2 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 14mm F1.4 DG DN is the longer of the two lenses at 150mm. The Tamron 20mm F2.8 Di III OSD M1:2 with a length of 64mm, is 86mm shorter. Besides being longer, the Sigma 14mm F1.4 DG DN also has a larger diameter of 101mm compared to the Tamron 20mm F2.8 Di III OSD M1:2's 73mm 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. Tamron 20mm F2.8 Di III OSD M1:2 weighs 220g, 81% (950g) lighter than the Sigma 14mm F1.4 DG DN's weight of 1170g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Ultra-Wideangle Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Sigma 14mm F1.4 DG DN and the Tamron 20mm F2.8 Di III OSD M1:2 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Sigma 14mm F1.4 DG DN is also available in the Leica L mount.
Focal Range
Sigma 14mm F1.4 DG DN is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
21mm.
On the other hand, the Tamron 20mm F2.8 Di III OSD M1:2 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.
