Here are three lenses that would naturally be on a photographer’s shortlist if they were looking for a wide angle lens for their Canon camera. The 28mm and the 24mm f2.8 lenses were announced together in early 2012 and both sport image stabilization, which is missing on the 28mm f1.8 that has been part of Canon’s range since the middle of 1995. Image stabilization is great to have, especially in a slower lens, giving the photographer the confidence to work hand held. The 28mm f1.8 is, however also the cheapest of the trio so is the extra stop of light a real bargain? Unfortunately not: The 28mm f1.8 is the poorest performer by quite a margin, especially in resolution.
The control of chromatic aberration tells a similar story. While all three lenses are fairly consistent in themselves, the newer two are consistently good where the 28mm f1.8 is consistently just OK.
Among Canon’s own lenses the EF 28mm f2.8 IS USM can hold its head high, it performs very well, so is it worth looking further afield too? Carl Zeiss also produces a 28mm lens in Canon fit, their Distagon f2 ZE. Without image stabilization or auto focus this is a lens that needs to perform significantly better to justify costing twice as much: It doesn’t, it actually matches the Canon virtually point for point, it’s only benefit apparently being its wider aperture. However Canon’s image stabilization installed in their 28mm could more than compensate for this loss of a stop leaving the beautifully built Zeiss lens out on a bit of a limb.
If your search is for a wider than standard lens and you are content to accept something a little less wide then another lens you could add to the shortlist is Sigma’s excellent 35mm F1.4 DG HSM A. Only slightly more expensive than the 28mm Canon lens it boast 2 stops of extra light, enough to be able to capture shallow depth of field if you want to and it does perform very well even wide open. It scores higher in DxOMark tests than any other wide lens for Canon. Of course if you need a 28mm then a 35mm isn’t going to be any good, but this is a lens worth keeping in mind.