Not sure exactly how to do this on the T3, but take the mode dial to Av, change the metering mode to spot metering (manual will tell you exactly how), change ISO to 100, push the button that has an icon that looks like 4 or 5 little squares, and then look through the viewfinder, now use the scroll button to select the center focus point. Put that focus point on the sun, press the shutter button halfway down to focus, then use the scroll button again, move it one way or the other until the numer changes, start out at 8.0 and see how that works... if the shutter is too slow (blurry pic), make the number smaller and try again.