The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 60-600mm F4.5-6.3 DG OS and the Tamron 18-400mm F3.5-6.3 VC 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 60-600mm F4.5-6.3 DG OS is the longer of the two lenses at 269mm. The Tamron 18-400mm F3.5-6.3 VC with a length of 124mm, is 145mm shorter. Besides being longer, the Sigma 60-600mm F4.5-6.3 DG OS also has a larger diameter of 120mm compared to the Tamron 18-400mm F3.5-6.3 VC's 79mm 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. Tamron 18-400mm F3.5-6.3 VC weighs 710g, 73% (1990g) lighter than the Sigma 60-600mm F4.5-6.3 DG OS's weight of 2700g.
Filter Threads
The Sigma 60-600mm F4.5-6.3 DG OS has a filter size of 105mm whereas the Tamron 18-400mm F3.5-6.3 VC has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sigma 60-600mm F4.5-6.3 DG OS:
And these are the 72mm filters that we recommend for the Tamron 18-400mm F3.5-6.3 VC:
Lens Mounts
The Sigma 60-600mm F4.5-6.3 DG OS has the Nikon F (FX) lens mount whereas the Tamron 18-400mm F3.5-6.3 VC has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Sigma 60-600mm F4.5-6.3 DG OS is also available in the Canon EF and Sigma SA mounts.
Tamron 18-400mm F3.5-6.3 VC is also available in Canon EF-S mount.
Focal Range
Sigma 60-600mm F4.5-6.3 DG OS has a focal range of 60-600mm 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
90 - 900mm.
On the other hand, the Tamron 18-400mm F3.5-6.3 VC has a focal range of 18-400mm and 22.2X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-600mm when used on a APS-C / DX format camera.
