The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-50mm F2.8 DC DN C and the Sony FE 28-70mm F3.5-5.6 OSS 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. Sony FE 28-70mm F3.5-5.6 OSS is the longer of the two lenses at 83mm. The Sigma 18-50mm F2.8 DC DN C with a length of 75mm, is 8mm shorter. Besides being longer, the Sony FE 28-70mm F3.5-5.6 OSS also has a larger diameter of 73mm compared to the Sigma 18-50mm F2.8 DC DN C's 65mm diameter.
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Below you can find a scaled side-by-side image of Sigma 18-50mm F2.8 DC DN C and Sony FE 28-70mm F3.5-5.6 OSS to get a better idea of how their sizes compare in real life.
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 18-50mm F2.8 DC DN C weighs 290g, which means it is 5g (1%) lighter than the Sony FE 28-70mm F3.5-5.6 OSS which has a weight of 295g.
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Filter Threads
Both the Sigma 18-50mm F2.8 DC DN C and the Sony FE 28-70mm F3.5-5.6 OSS have the same Filter thread size of 55mm.
Below are links to the 55mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 18-50mm F2.8 DC DN C has the Leica L lens mount whereas the Sony FE 28-70mm F3.5-5.6 OSS has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Leica TL2, Leica TL and Leica T Typ 701 for the Leica L Mount and Sony A9 III, Sony A7C Mark II and Sony A7CR for the Sony E Mount.
Sigma 18-50mm F2.8 DC DN C is also available in Sony E and Fujifilm X mounts.
Focal Range
Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and
2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-75mm when used on a APS-C / DX format camera.
On the other hand, the Sony FE 28-70mm F3.5-5.6 OSS has a focal range of 28-70mm and 2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42 - 105mm.