I rented the Sigma lens to compare it to the Canon 50 1.2L that I rented a few weeks back and so far I'm very impressed with it. I am getting more infocus and sharp photos @ 1.4 than I was with the 1.2. I did use my flash to lighten up her eyes. I think that I may buy this lens and a plus for me is that all of my filters for my Canon 24-105 L are 77mm so they will fit this lens.
I took this the other night to experiment as well. I wish that I'd taken some with my Canon 17-55 2.8 lens to compare. I'll have to see if they are out tonight. Firefly's, taken @ f 1.4 for 30 seconds.
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