The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20-200mm F3.5-6.3 and the Tamron 28-300mm f3.5-6.3 VC PZD 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 20-200mm F3.5-6.3 is the longer of the two lenses at 118mm. The Tamron 28-300mm f3.5-6.3 VC PZD with a length of 96mm, is 22mm shorter. Besides being longer, the Sigma 20-200mm F3.5-6.3 also has a larger diameter of 77mm compared to the Tamron 28-300mm f3.5-6.3 VC PZD's 74mm diameter.
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.
Filter Threads
The Sigma 20-200mm F3.5-6.3 has a filter size of 72mm whereas the Tamron 28-300mm f3.5-6.3 VC PZD 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 Sigma 20-200mm F3.5-6.3:
And these are the 67mm filters that we recommend for the Tamron 28-300mm f3.5-6.3 VC PZD:
Lens Mounts
The Sigma 20-200mm F3.5-6.3 has the Sony E lens mount whereas the Tamron 28-300mm f3.5-6.3 VC PZD has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Sigma 20-200mm F3.5-6.3 is also available in the Leica L mount.
Tamron 28-300mm f3.5-6.3 VC PZD is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Sigma 20-200mm F3.5-6.3 has a focal range of 20-200mm and
10.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30 - 300mm.
On the other hand, the Tamron 28-300mm f3.5-6.3 VC PZD has a focal range of 28-300mm and 10.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 42 - 450mm.
