Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Viltrox 14mm F4.0 is the longer of the two lenses at 56mm. The Sigma 17mm F4 DG DN C with a length of 49mm, is 7mm shorter. Besides being longer, the Viltrox 14mm F4.0 also has a larger diameter of 65mm 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. Viltrox 14mm F4.0 weighs 170g, which means it is 55g (24%) lighter than the Sigma 17mm F4 DG DN C which has a weight of 225g.
Lens Mounts
The Viltrox 14mm F4.0 has the Sony E lens mount whereas the Sigma 17mm F4 DG DN C has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
Sigma 17mm F4 DG DN C is also available in Sony E mount.
Focal Range
Viltrox 14mm F4.0 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 Sigma 17mm F4 DG DN C is a prime lens with fixed focal lenght of 17mm.
