Is there any technique to improve the focus on this lens I find once the contrast is lost the focus becomes stubborn, very frustrating. On some days I find the sigma a focus champ. Interesting note it seems to work a little better on my rebel xt rather than my friend's xti. Funny note, I find the focus is much much faster and reliable on my 70-200 L with a 1.4X conv. I would have thought that the extender would slow the focus of the L lens. since it is now f4. Thanks, garman
I would like to add another question, would focus speed and reliability improve if I move up to a 40D body, which is my intention next year.