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 Samyang T-S 24mm f3.5 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. Samyang T-S 24mm f3.5 is the longer of the two lenses at 112mm. The Sigma 20mm F1.4 DG DN A with a length of 111mm, is 1mm shorter. On the other hand, the Sigma 20mm F1.4 DG DN A has a larger diameter of 88mm compared to the Samyang T-S 24mm f3.5's 86mm 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. Sigma 20mm F1.4 DG DN A weighs 635g, which means it is 45g (6%) lighter than the Samyang T-S 24mm f3.5 which has a weight of 680g.
Filter Threads
Both the Sigma 20mm F1.4 DG DN A and the Samyang T-S 24mm f3.5 have the same Filter thread size of 82mm.
Below are links to the 82mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 20mm F1.4 DG DN A and the Samyang T-S 24mm f3.5 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Sigma 20mm F1.4 DG DN A is also available in Leica L mount.
Samyang T-S 24mm f3.5 is also available in Canon EF , Nikon F (FX), Pentax KAF and Sony Alpha mounts.
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 Samyang T-S 24mm f3.5 is a prime lens with fixed focal lenght of 24mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 36mm.