The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 20-70mm F4 G and the Sigma 70-200mm F2.8 EX DG HSM 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 70-200mm F2.8 EX DG HSM II is the longer of the two lenses at 184mm. The Sony FE 20-70mm F4 G with a length of 99mm, is 85mm shorter. Besides being longer, the Sigma 70-200mm F2.8 EX DG HSM II also has a larger diameter of 87mm compared to the Sony FE 20-70mm F4 G's 79mm 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 20-70mm F4 G weighs 488g, which means it is 902g (64%) lighter than the Sigma 70-200mm F2.8 EX DG HSM II which has a weight of 1390g.
Filter Threads
The Sony FE 20-70mm F4 G has a filter size of 72mm whereas the Sigma 70-200mm F2.8 EX DG HSM 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 72mm filters that we recommend you to consider for the Sony FE 20-70mm F4 G:
And these are the 77mm filters that we recommend for the Sigma 70-200mm F2.8 EX DG HSM II:
Lens Mounts
The Sony FE 20-70mm F4 G has the Sony E lens mount whereas the Sigma 70-200mm F2.8 EX DG HSM II has the Nikon F (FX) 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 Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 70-200mm F2.8 EX DG HSM II is also available in Canon EF , Four Thirds, Pentax KAF3, Sony Alpha and Sigma SA mounts.
Focal Range
Sony FE 20-70mm F4 G has a focal range of 20-70mm and
3.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30 - 105mm.
On the other hand, the Sigma 70-200mm F2.8 EX DG HSM 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.
