The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 18-270mm f3.5-6.3 II VC PZD and the Canon 70-300mm f4-5.6L IS USM 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 70-300mm f4-5.6L IS USM is the longer of the two lenses at 143mm. The Tamron 18-270mm f3.5-6.3 II VC PZD with a length of 88mm, is 55mm shorter. Besides being longer, the Canon 70-300mm f4-5.6L IS 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, which means it is 600g (57%) lighter than the Canon 70-300mm f4-5.6L IS USM which has a weight of 1050g.
Filter Threads
The Tamron 18-270mm f3.5-6.3 II VC PZD has a filter size of 62mm whereas the Canon 70-300mm f4-5.6L IS USM has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Tamron 18-270mm f3.5-6.3 II VC PZD:
And these are the 67mm filters that we recommend for the Canon 70-300mm f4-5.6L IS USM:
Lens Mounts
Both the Tamron 18-270mm f3.5-6.3 II VC PZD and the Canon 70-300mm f4-5.6L IS USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon T8i, Canon 90D and Canon SL3.
Tamron 18-270mm f3.5-6.3 II VC PZD is also available in Nikon F (DX) mount.
Focal Range
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
28.8-432mm when used on a APS-C / DX format camera.
On the other hand, the Canon 70-300mm f4-5.6L IS USM has a focal range of 70-300mm and 4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 112 - 480mm.