Canon 40d change aperture in manual mode

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I usually have my camera in either Av or Manual mode. Because I'm used to using the scroll wheel on the top of the camera to change the Can't change aperture in manual mode in Canon EOS Digital Cameras. My wife took our Canon 40D out today and came home and said she The EOS 40D is a high-performance, digital SLR camera featuring a pressing the button and changing the setting. Aperture-Priority AE.with a variable-aperture lens, you need to set the aperture value to F/5.6, simply because the lens isn't capable of doing F/3.5 at the long end