The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 28-75mm F2.8 Di III and the Sony FE 28-70mm F3.5-5.6 OSS for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Tamron 28-75mm F2.8 Di III is the longer of the two lenses at 117mm. The Sony FE 28-70mm F3.5-5.6 OSS with a length of 83mm is 34mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 73mm.
Below you can find the scaled side by side image of Tamron 28-75mm F2.8 Di III and Sony FE 28-70mm F3.5-5.6 OSS to get a better idea of how their size compare in real life.
Comparison image of Tamron 28-75mm F2.8 Di III and Sony FE 28-70mm F3.5-5.6 OSS Size and Weight 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. Sony FE 28-70mm F3.5-5.6 OSS weighs 295g, 46% (255g) lighter than the Tamron 28-75mm F2.8 Di III's weight of 550g.
Below you can find the dimension and weight table of the 'Standard Zoom Lenses in Sony E Mount for size comparison purposes.
Standard Zoom Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both Tamron 28-75mm F2.8 Di III and Sony FE 28-70mm F3.5-5.6 OSS 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.
Focal Range
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 an 35mm (FF) equivalent of 42 - 112.5mm.
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 an 35mm (FF) equivalent of 42 - 105mm.