The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 20-40mm F2.8 VXD and the Sigma 28-70mm F2.8 DG DN 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 is the longer of the two lenses at 102mm. The Tamron 20-40mm F2.8 VXD with a length of 86mm, is 16mm shorter. On the other hand, the Tamron 20-40mm F2.8 VXD has a larger diameter of 74mm compared to the Sigma 28-70mm F2.8 DG DN's 72mm diameter.
Below you can find a scaled side-by-side image of Tamron 20-40mm F2.8 VXD and Sigma 28-70mm F2.8 DG DN to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 20-40mm F2.8 VXD and the Sigma 28-70mm F2.8 DG DN 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. Tamron 20-40mm F2.8 VXD weighs 365g, which means it is 105g (22%) lighter than the Sigma 28-70mm F2.8 DG DN which has a weight of 470g.
Filter Threads
Both the Tamron 20-40mm F2.8 VXD and the Sigma 28-70mm F2.8 DG DN have the same Filter thread size of 67mm .
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Tamron 20-40mm F2.8 VXD and the Sigma 28-70mm F2.8 DG DN has the same Sony E lens mount . Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5 , Sony A7R VI and Sony A7 V .
Focal Range
Tamron 20-40mm F2.8 VXD has a focal range of 20-40mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30 - 60mm .
On the other hand, the Sigma 28-70mm F2.8 DG DN 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 .
