The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon EF 400mm F2.8L IS III USM and the Tamron 150-600mm f5-6.3 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. Canon EF 400mm F2.8L IS III USM is the longer of the two lenses at 343mm. The Tamron 150-600mm f5-6.3 VC with a length of 258mm, is 85mm shorter. Besides being longer, the Canon EF 400mm F2.8L IS III USM also has a larger diameter of 163mm compared to the Tamron 150-600mm f5-6.3 VC's 106mm 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 150-600mm f5-6.3 VC weighs 1951g, 31% (889g) lighter than the Canon EF 400mm F2.8L IS III USM's weight of 2840g.
Filter Threads
The Canon EF 400mm F2.8L IS III USM has a filter size of 52mm whereas the Tamron 150-600mm f5-6.3 VC has a 95mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Canon EF 400mm F2.8L IS III USM:
And these are the 95mm filters that we recommend for the Tamron 150-600mm f5-6.3 VC:
Lens Mounts
Both the Canon EF 400mm F2.8L IS III USM and the Tamron 150-600mm f5-6.3 VC has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K.
Tamron 150-600mm f5-6.3 VC is also available in Nikon F (FX) and Sony Alpha mounts.
Focal Range
Canon EF 400mm F2.8L IS III USM is a prime lens with fixed focal lenght of 400mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
640mm.
On the other hand, the Tamron 150-600mm f5-6.3 VC has a focal range of 150-600mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 240 - 960mm.
