The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 16mm F1.4 DC DN L 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 16mm F1.4 DC DN L is the longer of the two lenses at 92mm. The Samyang AF 18mm F2.8 FE with a length of 61mm, is 31mm shorter. Besides being longer, the Sigma 16mm F1.4 DC DN L also has a larger diameter of 72mm 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, 64% (260g) lighter than the Sigma 16mm F1.4 DC DN L's weight of 405g.
Filter Threads
The Sigma 16mm F1.4 DC DN L has a filter size of 67mm whereas the Samyang AF 18mm F2.8 FE has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Sigma 16mm F1.4 DC DN L:
And these are the 58mm filters that we recommend for the Samyang AF 18mm F2.8 FE:
Lens Mounts
The Sigma 16mm F1.4 DC DN L has the Leica L lens mount whereas the Samyang AF 18mm F2.8 FE has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Leica TL2, Leica TL and Leica T Typ 701 for the Leica L Mount and Sony A9 III, Sony A7C Mark II and Sony A7CR for the Sony E Mount.
Focal Range
Sigma 16mm F1.4 DC DN L is a prime lens with fixed focal lenght of 16mm which has an effective (full-frame 35mm equivalent) focal range of
24mm when used on a APS-C / DX format camera.
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.