The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12-24mm F4.5-5.6 II DG HSM and the Canon 17-40mm f4.0L 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. Sigma 12-24mm F4.5-5.6 II DG HSM is the longer of the two lenses at 120mm. The Canon 17-40mm f4.0L USM with a length of 97mm, is 23mm shorter. Besides being longer, the Sigma 12-24mm F4.5-5.6 II DG HSM also has a larger diameter of 87mm compared to the Canon 17-40mm f4.0L USM's 84mm 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 17-40mm f4.0L USM weighs 500g, 25% (170g) lighter than the Sigma 12-24mm F4.5-5.6 II DG HSM's weight of 670g.
Lens Mounts
The Sigma 12-24mm F4.5-5.6 II DG HSM has the Nikon F (FX) lens mount whereas the Canon 17-40mm f4.0L USM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) 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 12-24mm F4.5-5.6 II DG HSM is also available in the Canon EF and Sigma SA mounts.
Focal Range
Sigma 12-24mm F4.5-5.6 II DG HSM has a focal range of 12-24mm 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
18 - 36mm.
On the other hand, the Canon 17-40mm f4.0L USM has a focal range of 17-40mm and 2.4X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 27.2 - 64mm.
