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One of the best situations in which to consider a third party lens is when the camera body manufacturer does not have an equivalent offering. Meet the Sigma 20mm f/1.8 EX DG Lens – as of this writing, Canon does not offer a lens this wide with an aperture this large. Unfortunately, I consider the Sigma 20mm f/1.8 EX DG Lens to be unusable at f/1.8 unless you are looking for a soft-focus effect. This lens is one of the softest I’ve seen wide open. Realistically, this will be an f/2.8 lens to most people as the center does not become decently sharp until this aperture. Sorry Sigma, this one is a dud. If you want a fast 20mm lens, I suggest saving for the Canon EF 16-35mm f/2.8 L USM Lens. It far surpasses the performance of the current Sigma and Canon 20mm lenses in all regards. READ FULL REVIEW
Other Sigma 20mm f/1.8 EX AF Reviews
Photo Zone (Canon Mount Tested)
Due to its ultra-large max. aperture the Sigma AF 20mm f/1.8 EX is very ambitious lens. In theory you may argue that lens may be used for low light photography but its performance at max. aperture isn’t really good enough for this. However, thanks to the very reduced depth-of-field you can exploit some creative potential at f/1.8 by blurring the surroundings of an object (see e.g. the flower pot sample shot above). At a more conventional aperture setting of f/2.8 the lens is already capable to deliver decent results and at medium apertures it is even excellent. Besides being faster the lens is slightly, sometimes even substantially cheaper than genuine manufacturer 20mm lenses so it can give you lots of bangs for your bucks … assuming a good sample that is. READ FULL REVIEW