The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24-35mm F2 DG HSM A and the Canon 28mm f2.8 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 24-35mm F2 DG HSM A is the longer of the two lenses at 123mm. The Canon 28mm f2.8 with a length of 43mm is 80mm shorter. Besides being longer, the Sigma 24-35mm F2 DG HSM A also has a larger diameter of 88mm compared to Canon 28mm f2.8's 67mm 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. Canon 28mm f2.8 weighs 185g, 80% (756g) lighter than the Sigma 24-35mm F2 DG HSM A's weight of 941g.
Both Sigma 24-35mm F2 DG HSM A and Canon 28mm f2.8 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 24-35mm F2 DG HSM A is also available in Nikon F (FX) and Sigma SA mounts.
Sigma 24-35mm F2 DG HSM A has a focal range of 24-35mm and 1.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 38.4 - 56mm.
Canon 28mm f2.8 is a prime lens with fixed focal lenght of 28mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 44.8mm.