The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 16-28mm F2.8 E and the Tamron 11-20mm F2.8 Di III-A for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sigma 16-28mm F2.8 E is the longer of the two lenses at 101mm. The Tamron 11-20mm F2.8 Di III-A with a length of 86mm, is 15mm shorter. Besides being longer, the Sigma 16-28mm F2.8 E also has a larger diameter of 77mm compared to the Tamron 11-20mm F2.8 Di III-A's 73mm diameter.
Below you can find a scaled side-by-side image of Sigma 16-28mm F2.8 E and Tamron 11-20mm F2.8 Di III-A to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 16-28mm F2.8 E and the Tamron 11-20mm F2.8 Di III-A Size and Weight The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Tamron 11-20mm F2.8 Di III-A weighs 335g, 25% (115g) lighter than the Sigma 16-28mm F2.8 E's weight of 450g.
Below you can find the dimension and weight table of the Wideangle Zoom Lenses in Sony E Mount for size comparison purposes.
Wideangle Zoom Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Sigma 16-28mm F2.8 E and the Tamron 11-20mm F2.8 Di III-A has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A7R V, Sony FX30 and Sony A7 IV.
Tamron 11-20mm F2.8 Di III-A is also available in Fujifilm X mount.
Focal Range
Sigma 16-28mm F2.8 E has a focal range of 16-28mm and 1.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 24 - 42mm.
Tamron 11-20mm F2.8 Di III-A has a focal range of 11-20mm and 1.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 16.5 - 30mm.