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 17-28mm F2.8 Di III for their suitability to various photography scenarios:
Size and Weight Comparison Below you can find a scaled side-by-side image of Sony FE 20-70mm F4 G and Tamron 17-28mm 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 17-28mm 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. Tamron 17-28mm F2.8 Di III weighs 420g, 13% (68g) lighter than the Sony FE 20-70mm F4 G's weight of 488g.
Filter Threads
The Sony FE 20-70mm F4 G has a filter size of 72mm whereas the Tamron 17-28mm 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 17-28mm F2.8 Di III:
Lens Mounts
Both the Sony FE 20-70mm F4 G and the Tamron 17-28mm 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 .
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 17-28mm F2.8 Di III has a focal range of 17-28mm and 1.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 25.5 - 42mm .
