The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 35mm F2 DG DN and the Samyang AF 18mm F2.8 FE 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 35mm F2 DG DN is the longer of the two lenses at 65mm. The Samyang AF 18mm F2.8 FE with a length of 61mm, is 4mm shorter. Besides being longer, the Sigma 35mm F2 DG DN also has a larger diameter of 70mm compared to the Samyang AF 18mm F2.8 FE's 64mm 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. Samyang AF 18mm F2.8 FE weighs 145g, 55% (180g) lighter than the Sigma 35mm F2 DG DN's weight of 325g.
Filter Threads
Both the Sigma 35mm F2 DG DN and the Samyang AF 18mm F2.8 FE have the same Filter thread size of 58mm.
Below are links to the 58mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 35mm F2 DG DN and the Samyang AF 18mm F2.8 FE 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 35mm F2 DG DN is also available in Leica L mount.
Focal Range
Sigma 35mm F2 DG DN is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
On the other hand, the Samyang AF 18mm F2.8 FE is a prime lens with fixed focal lenght of 18mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 27mm.