The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 17-40mm f1.8 and the Tamron 28-75mm F2.8 Di III 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. Tamron 28-75mm F2.8 Di III is the longer of the two lenses at 118mm. The Sigma 17-40mm f1.8 with a length of 116mm, is 2mm shorter. Besides being longer, the Tamron 28-75mm F2.8 Di III also has a larger diameter of 76mm compared to the Sigma 17-40mm f1.8's 73mm diameter.
Below you can find a scaled side-by-side image of Sigma 17-40mm f1.8 and Tamron 28-75mm F2.8 Di III to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 17-40mm f1.8 and the Tamron 28-75mm F2.8 Di III 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 17-40mm f1.8 weighs 535g, which means it is 5g (0%) lighter than the Tamron 28-75mm F2.8 Di III which has a weight of 540g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Sony E Mount for size comparison purposes.
Standard Sony E Mount
Filter Threads
Both the Sigma 17-40mm f1.8 and the Tamron 28-75mm F2.8 Di III 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 Sigma 17-40mm f1.8 and the Tamron 28-75mm F2.8 Di III has the same Sony E lens mount . Some of the latest released cameras that are compatible with the Sony E lenses are Sony ZV-E10 II , Sony A6700 and Sony FX30 .
Leica L , Fujifilm X and Canon RF mounts.
Sony E and Nikon Z mounts.
Focal Range
Sigma 17-40mm f1.8 has a focal range of 17-40mm and
2.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
25.5-60mm when used on a APS-C / DX format camera.
On the other hand, the Tamron 28-75mm F2.8 Di III has a focal range of 28-75mm and 2.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42 - 112.5mm .
