The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 28-70mm F2L USM and the Sigma 24-70mm F2.8 EX DG 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 28-70mm F2L USM is the longer of the two lenses at 140mm. The Sigma 24-70mm F2.8 EX DG with a length of 116mm, is 24mm shorter. Besides being longer, the Canon RF 28-70mm F2L USM also has a larger diameter of 104mm compared to the Sigma 24-70mm F2.8 EX DG's 89mm 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. Sigma 24-70mm F2.8 EX DG weighs 715g, 50% (715g) lighter than the Canon RF 28-70mm F2L USM's weight of 1430g.
Filter Threads
The Canon RF 28-70mm F2L USM has a filter size of 95mm whereas the Sigma 24-70mm F2.8 EX DG has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 95mm filters that we recommend you to consider for the Canon RF 28-70mm F2L USM:
And these are the 82mm filters that we recommend for the Sigma 24-70mm F2.8 EX DG:
Lens Mounts
The Canon RF 28-70mm F2L USM has the Canon RF lens mount whereas the Sigma 24-70mm F2.8 EX DG 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.
Sigma 24-70mm F2.8 EX DG is also available in Pentax KAF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Focal Range
Canon RF 28-70mm F2L USM has a focal range of 28-70mm and
2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
44.8 - 112mm.
On the other hand, the Sigma 24-70mm F2.8 EX DG has a focal range of 24-70mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 38.4 - 112mm.
