The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 300-600mm f4 and the Canon RF 400mm F2.8L 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. Sigma 300-600mm f4 is the longer of the two lenses at 468mm. The Canon RF 400mm F2.8L with a length of 367mm, is 101mm shorter. Besides being longer, the Sigma 300-600mm f4 also has a larger diameter of 167mm compared to the Canon RF 400mm F2.8L's 163mm diameter.
Below you can find a scaled side-by-side image of Sigma 300-600mm f4 and Canon RF 400mm F2.8L to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 300-600mm f4 and the Canon RF 400mm F2.8L 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. Canon RF 400mm F2.8L weighs 2890g, 27% (1095g) lighter than the Sigma 300-600mm f4's weight of 3985g.
Filter Threads
The Sigma 300-600mm f4 has a filter size of 41mm whereas the Canon RF 400mm F2.8L has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 41mm filters that we recommend you to consider for the Sigma 300-600mm f4:
And these are the 52mm filters that we recommend for the Canon RF 400mm F2.8L:
Lens Mounts
The Sigma 300-600mm f4 has the Leica L lens mount whereas the Canon RF 400mm F2.8L has the Canon RF lens mount . Some of the latest released cameras that are compatible with these mounts are Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Canon R6 V , Canon R6 III and Canon C50 for the Canon RF Mount.
Focal Range
Sigma 300-600mm f4 has a focal range of 300-600mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
450 - 900mm .
On the other hand, the Canon RF 400mm F2.8L 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 .
