Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Viltrox AF 16mm f1.8 FE is the longer of the two lenses at 103mm. The Sigma 17mm F4 DG DN C with a length of 51mm, is 52mm shorter. Besides being longer, the Viltrox AF 16mm f1.8 FE also has a larger diameter of 85mm compared to the Sigma 17mm F4 DG DN C'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. Sigma 17mm F4 DG DN C weighs 220g, 60% (330g) lighter than the Viltrox AF 16mm f1.8 FE's weight of 550g.
Filter Threads
The Viltrox AF 16mm f1.8 FE has a filter size of 77mm whereas the Sigma 17mm F4 DG DN C has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Viltrox AF 16mm f1.8 FE:
And these are the 55mm filters that we recommend for the Sigma 17mm F4 DG DN C:
Lens Mounts
Both the Viltrox AF 16mm f1.8 FE and the Sigma 17mm F4 DG DN C 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 17mm F4 DG DN C is also available in Leica L mount.
Focal Range
Viltrox AF 16mm f1.8 FE is a prime lens with fixed focal lenght of 16mm.
On the other hand, the Sigma 17mm F4 DG DN C is a prime lens with fixed focal lenght of 17mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 25.5mm.
