The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 120-300mm F2.8 DG OS HSM and the Sony FE 70-200mm F2.8 GM II 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 DG OS HSM is the longer of the two lenses at 291mm. The Sony FE 70-200mm F2.8 GM II with a length of 200mm, is 91mm shorter. Besides being longer, the Sigma 120-300mm F2.8 DG OS HSM also has a larger diameter of 124mm compared to the Sony FE 70-200mm F2.8 GM II's 88mm 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. Sony FE 70-200mm F2.8 GM II weighs 1045g, 64% (1905g) lighter than the Sigma 120-300mm F2.8 DG OS HSM's weight of 2950g.
Filter Threads
The Sigma 120-300mm F2.8 DG OS HSM has a filter size of 105mm whereas the Sony FE 70-200mm F2.8 GM II has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sigma 120-300mm F2.8 DG OS HSM:
And these are the 77mm filters that we recommend for the Sony FE 70-200mm F2.8 GM II:
Lens Mounts
The Sigma 120-300mm F2.8 DG OS HSM has the Sigma SA lens mount whereas the Sony FE 70-200mm F2.8 GM II has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount and Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount.
Sigma 120-300mm F2.8 DG OS HSM is also available in the Canon EF and Nikon F (FX) mounts.
Focal Range
Sigma 120-300mm F2.8 DG OS HSM has a focal range of 120-300mm and
2.5X zoom ratio .
On the other hand, the Sony FE 70-200mm F2.8 GM II has a focal range of 70-200mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105 - 300mm.
