Re: Dust issue - Rebel XT
When you stop your aperture down, the DOF becomes less shallow and particles become more apparent.
If you open up IE to a white page, take your camera and set it to the highest aperture(F/28 or whatever yours it) and properly expose a photo of the blanks screen(no matter the shutter length) you'll see your dust culprit. you need a blower bulb to get them off, or you can send your camera into canon and they'll clean it for a fee.
Re: Dust issue - Rebel XT
Thanks, that makes sense. That's what I figured. I'll give that a shot.