The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 15mm f1.4 DC C and the Viltrox 28mm F4.5 XF 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 15mm f1.4 DC C is the longer of the two lenses at 65mm. The Viltrox 28mm F4.5 XF with a length of 20mm, is 45mm shorter. Besides being longer, the Sigma 15mm f1.4 DC C also has a larger diameter of 64mm compared to the Viltrox 28mm F4.5 XF's 60mm 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 XF weighs 88g, 60% (137g) lighter than the Sigma 15mm f1.4 DC C's weight of 225g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Fujifilm X Mount for size comparison purposes.
Wideangle Lenses in Fujifilm X Mount for Size Comparison
Lens Mounts
Both the Sigma 15mm f1.4 DC C and the Viltrox 28mm F4.5 XF has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5.
Sigma 15mm f1.4 DC C is also available in the Canon RF and Sony E mounts.
Focal Range
Sigma 15mm f1.4 DC C is a prime lens with fixed focal lenght of 15mm which has an effective (full-frame 35mm equivalent) focal range of
22.5mm when used on a APS-C / DX format camera.
On the other hand, the Viltrox 28mm F4.5 XF 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.
