The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 20-70mm F4 G 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 117mm. The Sony FE 20-70mm F4 G with a length of 99mm, is 18mm shorter. On the other hand, the Sony FE 20-70mm F4 G has a larger diameter of 79mm compared to the Tamron 28-75mm F2.8 Di III's 73mm diameter.
Below you can find a scaled side-by-side image of Sony FE 20-70mm F4 G 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 Sony FE 20-70mm F4 G 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. Sony FE 20-70mm F4 G weighs 488g, which means it is 62g (11%) lighter than the Tamron 28-75mm F2.8 Di III which has a 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 Sony E Mount
Filter Threads
The Sony FE 20-70mm F4 G has a filter size of 72mm whereas the Tamron 28-75mm F2.8 Di III has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Sony FE 20-70mm F4 G:
And these are the 67mm filters that we recommend for the Tamron 28-75mm F2.8 Di III:
Lens Mounts
Both the Sony FE 20-70mm F4 G 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 FX5 , Sony A7R VI and Sony A7 V .
Sony E and Nikon Z mounts.
Focal Range
Sony FE 20-70mm F4 G has a focal range of 20-70mm and
3.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30 - 105mm .
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 .
