The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 28mm F4.5 Z and the Sigma 18-50mm F2.8 DC DN C 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 18-50mm F2.8 DC DN C is the longer of the two lenses at 77mm. The Viltrox 28mm F4.5 Z with a length of 22mm, is 55mm shorter. On the other hand, the Viltrox 28mm F4.5 Z has a larger diameter of 65mm compared to the Sigma 18-50mm F2.8 DC DN C's 62mm 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 28mm F4.5 Z weighs 88g, which means it is 197g (69%) lighter than the Sigma 18-50mm F2.8 DC DN C which has a weight of 285g.
Lens Mounts
The Viltrox 28mm F4.5 Z has the Nikon Z lens mount whereas the Sigma 18-50mm F2.8 DC DN C has the Fujifilm X lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon ZR, Nikon Z5 II and RED Komodo-X 6K Z for the Nikon Z Mount and Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount.
Sigma 18-50mm F2.8 DC DN C is also available in Leica L and Sony E mounts.
Focal Range
Viltrox 28mm F4.5 Z is a prime lens with fixed focal lenght of 28mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42mm.
On the other hand, the Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-75mm when used on a APS-C / DX format camera.
