I am waiting for the 50D to come in the mail from NewEgg to upgrade from my fairly new XSi I was using a 50D in Best Buy earlier and couldn't figure something out.
Supposing I am strictly looking through the viewfinder only (not LCD); on the XSi, I could change shutter speed by simply turning the wheel dial with my finger and could also quickly change the aperture by holding the AV+- button while also turning the same wheel. Doing this didn't cause me to have to look away from the VF at the LCD at all.
But using the 50D, I could only figure out how to change the f-stop by doing it via the quick control screen on the LCD screen, which includes pressing the little joystick, moving over to aperture, then scrolling the finger wheel. That's a lot of steps and does not work if looking through the VF because using the joystick stops the exposure numbers from showing in the VF until you re-press the shutter button halfway.
How can I quickly switch between shutter speed and aperture changing while never taking my eye away from the VF/VF display???
Please tell me there is a way to do this!