The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 70-300 F4.5-6.3 Di III and the Canon RF 100-400mm 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 RF 100-400mm is the longer of the two lenses at 165mm. The Tamron 70-300 F4.5-6.3 Di III with a length of 148mm, is 17mm shorter. Besides being longer, the Canon RF 100-400mm also has a larger diameter of 80mm compared to the Tamron 70-300 F4.5-6.3 Di III's 77mm diameter.
Below you can find a scaled side-by-side image of Tamron 70-300 F4.5-6.3 Di III and Canon RF 100-400mm to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 70-300 F4.5-6.3 Di III and the Canon RF 100-400mm Size and Weight 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 70-300 F4.5-6.3 Di III weighs 545g, which means it is 90g (14%) lighter than the Canon RF 100-400mm which has a weight of 635g.
Filter Threads
Both the Tamron 70-300 F4.5-6.3 Di III and the Canon RF 100-400mm 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 Tamron 70-300 F4.5-6.3 Di III has the Sony E lens mount whereas the Canon RF 100-400mm has the Canon RF 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 Canon R6 V , Canon R6 III and Canon C50 for the Canon RF Mount.
Focal Range
Tamron 70-300 F4.5-6.3 Di III has a focal range of 70-300mm and
4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
105 - 450mm .
On the other hand, the Canon RF 100-400mm has a focal range of 100-400mm 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 160 - 640mm .
