The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 100-400mm 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 RF 100-400mm is the longer of the two lenses at 165mm. The Canon 70-300mm f4-5.6L IS USM with a length of 143mm, is 22mm shorter. On the other hand, the Canon 70-300mm f4-5.6L IS USM has a larger diameter of 89mm compared to the Canon RF 100-400mm's 80mm 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. Canon RF 100-400mm weighs 635g, which means it is 415g (39%) lighter than the Canon 70-300mm f4-5.6L IS USM which has a weight of 1050g.
Filter Threads
Both the Canon RF 100-400mm and the Canon 70-300mm f4-5.6L IS USM 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 Canon RF 100-400mm has the Canon RF lens mount whereas the Canon 70-300mm f4-5.6L IS USM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Focal Range
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.
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.
