The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon EF 70-200 F2.8L IS III USM and the Tamron 18-270mm f3.5-6.3 II 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. Canon EF 70-200 F2.8L IS III USM is the longer of the two lenses at 199mm. The Tamron 18-270mm f3.5-6.3 II VC PZD with a length of 88mm, is 111mm shorter. Besides being longer, the Canon EF 70-200 F2.8L IS III USM also has a larger diameter of 89mm compared to the Tamron 18-270mm f3.5-6.3 II 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. Tamron 18-270mm f3.5-6.3 II VC PZD weighs 450g, 68% (990g) lighter than the Canon EF 70-200 F2.8L IS III USM's weight of 1440g.
Filter Threads
The Canon EF 70-200 F2.8L IS III USM has a filter size of 77mm whereas the Tamron 18-270mm f3.5-6.3 II VC PZD has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Canon EF 70-200 F2.8L IS III USM:
And these are the 62mm filters that we recommend for the Tamron 18-270mm f3.5-6.3 II VC PZD:
Lens Mounts
The Canon EF 70-200 F2.8L IS III USM has the Canon EF lens mount whereas the Tamron 18-270mm f3.5-6.3 II VC PZD has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Tamron 18-270mm f3.5-6.3 II VC PZD is also available in Canon EF mount.
Focal Range
Canon EF 70-200 F2.8L IS III USM has a focal range of 70-200mm and
2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
112 - 320mm.
On the other hand, the Tamron 18-270mm f3.5-6.3 II VC PZD has a focal range of 18-270mm and 15.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-405mm when used on a APS-C / DX format camera.
