The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24mm F1.8 EX DG and the Canon 17-55mm f2.8 IS 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. Canon 17-55mm f2.8 IS USM is the longer of the two lenses at 111mm. The Sigma 24mm F1.8 EX DG with a length of 83mm, is 28mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 84mm.
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 24mm F1.8 EX DG weighs 500g, which means it is 145g (22%) lighter than the Canon 17-55mm f2.8 IS USM which has a weight of 645g.
Filter Threads
Both the Sigma 24mm F1.8 EX DG and the Canon 17-55mm f2.8 IS USM have the same Filter thread size of 77mm.
Below are links to the 77mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 24mm F1.8 EX DG has the Canon EF lens mount whereas the Canon 17-55mm f2.8 IS USM has the Canon EF-S lens mount. Some of the latest released cameras that are compatible with these mounts are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount.
Sigma 24mm F1.8 EX DG is also available in the Canon EF , Nikon F (FX), Four Thirds, Pentax KAF, Sony Alpha, Sigma SA, Pentax KAF, Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Focal Range
Sigma 24mm F1.8 EX DG 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 a 35mm (FF) equivalent of
44.8mm.
On the other hand, the Canon 17-55mm f2.8 IS USM has a focal range of 17-55mm and 3.2X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27.2-88mm when used on a APS-C / DX format camera.
