The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 28-45mm 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. Sigma 28-45mm F1.8 is the longer of the two lenses at 151mm. The Tamron 28-75mm F2.8 Di III with a length of 118mm, is 33mm shorter. Besides being longer, the Sigma 28-45mm F1.8 also has a larger diameter of 88mm compared to the Tamron 28-75mm F2.8 Di III's 76mm diameter.
Below you can find a scaled side-by-side image of Sigma 28-45mm 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 28-45mm 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. Tamron 28-75mm F2.8 Di III weighs 540g, 43% (420g) lighter than the Sigma 28-45mm F1.8's weight of 960g.
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 Sigma 28-45mm F1.8 has a filter size of 82mm 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 82mm filters that we recommend you to consider for the Sigma 28-45mm F1.8:
And these are the 67mm filters that we recommend for the Tamron 28-75mm F2.8 Di III:
Lens Mounts
Both the Sigma 28-45mm 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 FX5 , Sony A7R VI and Sony A7 V .
Sony E and Nikon Z mounts.
Focal Range
Sigma 28-45mm F1.8 has a focal range of 28-45mm and
1.6X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 67.5mm .
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 .
