1. Fast: f1.8
2. Bright view: f1.8
3. Ring USM - fast focusing, quiet, gives you full time manual focusing
3. Good bokeh (background blur)
4. Well built

Lens tests show that it is worse than the f2.8 version

I am willing to carry around only two (prime) lenses, a short and a tele. I had a Sigma 24mm f2.8, but found the (perspective) distortion to be objectionable for people shots, and hence was looking for a 28mm. I chose this one because of the strengths listed above. f1.8 is one and a half stops faster faster than f2.8, and it makes a big difference for me when it comes to hand held people shots in low light. I just shot 2 rolls of Kodak Ektachrome 200 slide film with this lens and the results are outstanding. As someone else mentioned above you can save $$$ and duplicate (outdo in fact) the much coveted 28-70 f2.8L by the three primes: 28mm f1.8, 50mm f1.8 and 85mm f1.8.

Similar Products Used:

Sigma 24mm f2.8