Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Canon EF 11-24mm F4L USM is the longer of the two lenses at 132mm. The Sigma 12-24mm F4.5-5.6 EX DG HSM with a length of 103mm is 29mm shorter. Besides being longer, the Canon EF 11-24mm F4L USM also has a larger diameter of 108mm compared to Sigma 12-24mm F4.5-5.6 EX DG HSM's 87mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sigma 12-24mm F4.5-5.6 EX DG HSM weighs 600g, 94% (565g) lighter than the Canon EF 11-24mm F4L USM's weight of 1165g.
Below you can find the dimension and weight table of the 'Wideangle Zoom Lenses in Canon EF Mount for size comparison purposes.
Wideangle Zoom Lenses in Canon EF Mount for Size Comparison
Lens Mounts
Both Canon EF 11-24mm F4L USM and Sigma 12-24mm F4.5-5.6 EX DG HSM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 12-24mm F4.5-5.6 EX DG HSM is also available in Pentax KAF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Focal Range
Canon EF 11-24mm F4L USM has a focal range of 11-24mm and 2.2X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 17.6 - 38.4mm.
Sigma 12-24mm F4.5-5.6 EX 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 1.6x crop, it provides an 35mm (FF) equivalent of 19.2 - 38.4mm.