The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 100-400mm F5-6.3 OS and the Tamron 100-400mm F4.5-6.3 Di VC USD 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 100-400mm F4.5-6.3 Di VC USD is the longer of the two lenses at 199mm. The Sigma 100-400mm F5-6.3 OS with a length of 197mm, is 2mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 86mm.
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
Both the Sigma 100-400mm F5-6.3 OS and the Tamron 100-400mm F4.5-6.3 Di VC USD have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 100-400mm F5-6.3 OS has the Sony E lens mount whereas the Tamron 100-400mm F4.5-6.3 Di VC USD 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 100-400mm F5-6.3 OS is also available in the Leica L and Fujifilm X mounts.
Tamron 100-400mm F4.5-6.3 Di VC USD is also available in Canon EF mount.
Focal Range
Both lenses have the same focal range of
100-400mm but while Sigma 100-400mm F5-6.3 OS has the fastest aperture of
F5-6.3, the Tamron 100-400mm F4.5-6.3 Di VC USD's widest aperture value is
F4.5-6.3.
