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 28-70mm F2.8 DG 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 28-70mm F2.8 DG DN C is the longer of the two lenses at 102mm. The Sony FE 20-70mm F4 G with a length of 99mm, is 3mm shorter. On the other hand, the Sony FE 20-70mm F4 G has a larger diameter of 79mm compared to the Sigma 28-70mm F2.8 DG DN C's 72mm diameter.
Below you can find a scaled side-by-side image of Sony FE 20-70mm F4 G and Sigma 28-70mm F2.8 DG DN C to get a better idea of how their sizes compare in real life.
Comparison image of the Sony FE 20-70mm F4 G and the Sigma 28-70mm F2.8 DG DN C Size and Weight 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. Sigma 28-70mm F2.8 DG DN C weighs 470g, 3% (18g) lighter than the Sony FE 20-70mm F4 G's weight of 488g.
Filter Threads
The Sony FE 20-70mm F4 G has a filter size of 72mm whereas the Sigma 28-70mm F2.8 DG DN C has a 67mm 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 67mm filters that we recommend for the Sigma 28-70mm F2.8 DG DN C:
Lens Mounts
The Sony FE 20-70mm F4 G has the Sony E lens mount whereas the Sigma 28-70mm F2.8 DG DN C has the Leica L 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 Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
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 28-70mm F2.8 DG DN C has a focal range of 28-70mm and 2.5X zoom ratio .
