The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 35mm f1.2 FE and the Sigma 120-300mm F2.8 EX DG HSM 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 120-300mm F2.8 EX DG HSM is the longer of the two lenses at 271mm. The Viltrox 35mm f1.2 FE with a length of 122mm, is 149mm shorter. Besides being longer, the Sigma 120-300mm F2.8 EX DG HSM also has a larger diameter of 113mm compared to the Viltrox 35mm f1.2 FE's 89mm 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 35mm f1.2 FE weighs 920g, which means it is 1680g (64%) lighter than the Sigma 120-300mm F2.8 EX DG HSM which has a weight of 2600g.
Filter Threads
The Viltrox 35mm f1.2 FE has a filter size of 77mm whereas the Sigma 120-300mm F2.8 EX DG HSM has a 105mm 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 35mm f1.2 FE:
And these are the 105mm filters that we recommend for the Sigma 120-300mm F2.8 EX DG HSM:
Lens Mounts
The Viltrox 35mm f1.2 FE has the Sony E lens mount whereas the Sigma 120-300mm F2.8 EX DG HSM has the Canon EF 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 Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Sigma 120-300mm F2.8 EX DG HSM is also available in Sigma SA and Nikon F (FX) mounts.
Focal Range
Viltrox 35mm f1.2 FE is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
On the other hand, the Sigma 120-300mm F2.8 EX DG HSM has a focal range of 120-300mm and 2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 192 - 480mm.
