The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 70-300 F4.5-6.3 Di III and the Sigma 70-300mm F4-5.6 DG OS 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 70-300 F4.5-6.3 Di III is the longer of the two lenses at 148mm. The Sigma 70-300mm F4-5.6 DG OS with a length of 126mm, is 22mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 77mm.
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 70-300 F4.5-6.3 Di III weighs 545g, which means it is 65g (10%) lighter than the Sigma 70-300mm F4-5.6 DG OS which has a weight of 610g.
Filter Threads
The Tamron 70-300 F4.5-6.3 Di III has a filter size of 67mm whereas the Sigma 70-300mm F4-5.6 DG OS has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Tamron 70-300 F4.5-6.3 Di III:
And these are the 58mm filters that we recommend for the Sigma 70-300mm F4-5.6 DG OS:
Lens Mounts
The Tamron 70-300 F4.5-6.3 Di III has the Sony E lens mount whereas the Sigma 70-300mm F4-5.6 DG OS has the Nikon F (FX) 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 Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 70-300mm F4-5.6 DG OS is also available in Canon EF , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of
70-300mm but while Tamron 70-300 F4.5-6.3 Di III has the fastest aperture of
F4.5-6.3, the Sigma 70-300mm F4-5.6 DG OS's widest aperture value is
F4.0 - F5.6.
