I am absolutly torn between the Tokina 11-16 2.8 or the Tokina 10-17 3.5-4.5 Im leaning towards the 10-17 because it will give me the fish eye effect(and if i dont want it i can crop it out). But the 11-16 is much faster and has great IQ. So which one should i go with? All help is greatly appreciated. Thanks.