The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 400mm f4.0 DO IS USM and the Canon 300mm f2.8L IS II 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 300mm f2.8L IS II USM is the longer of the two lenses at 249mm. The Canon 400mm f4.0 DO IS USM with a length of 233mm, is 16mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 128mm.
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 400mm f4.0 DO IS USM weighs 1940g, which means it is 460g (19%) lighter than the Canon 300mm f2.8L IS II USM which has a weight of 2400g.
Filter Threads
Both the Canon 400mm f4.0 DO IS USM and the Canon 300mm f2.8L IS II USM have the same Filter thread size of 52mm.
Below are links to the 52mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Canon 400mm f4.0 DO IS USM and the Canon 300mm f2.8L IS II USM 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.
Focal Range
Canon 400mm f4.0 DO IS 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 Canon 300mm f2.8L IS II USM is a prime lens with fixed focal lenght of 300mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 480mm.
